All the nutrients in our food originally come from the soil. This maintains the soil fertility, so the farmer can continue to grow nutritious crops and healthy crops.
Farmers turn to fertilizers because these substances contain plant nutrients such as nitrogen, phosphorus, and potassium.
The drawback is that it needs to be used properly ( applied at the right time, in the correct form and correct amounts.
The Growing rate of chemicals and use of fertilizers in crops and grain are growing rapidly.
Explanation: Fertilizers are essential to the security of the world’s food supply, and they must be used properly. The manufacture, sale and transportation of fertilizers is heavily regulated. States have difference regulations and statutes that address fertilizer use and production to protect human health and the environment.
What are the chemicals in fertilizers?
Most chemical fertilizers are made by the reaction of an acid with an alkali. Packaged fertilizers also often contain three macronutrients: nitrogen, phosphorous and potassium. Ammonium nitrate, a good source of nitrogen and ammonium for plants, is also an important ingredient in the production of high quality, effective fertilizers.
With the global population steadily growing, it is important that enough crops are produced each year to provide food, clothing and other agricultural products to people around the world. Crops such as corn, wheat and cotton receive nutrients from the soil they are grown in; various crops deplete soil nutrients in different ways and rates. Some crop growth can deplete soil nutrients after just a few seasons of planting. Fertilizers play an important role in providing crops with the nutrients they need to grow and be harvested for nutritious food.
Hope this helped you out a little bit! Have a wonderful day.
Wildlife can be scarce in many large, densely populated cities. A few plants and animals can be found in these areas. For example, rats, mice, pigeons, cockroaches, and other insects are common in cities. Trees can grow by sidewalks or in local parks. Some cities even have small populations of coyotes within city limits. Do you think these cities meet the definition of an ecosystem? Explain your reasoning.
the answer for PLATO is:
"Yes, because these organisms likely depend on each other for survival. For example, plants and grasses can make food for insects and other small animals, such as rats. Carnivores can eat the small animals and obtain energy from them. Humans are also living things, sk they contribute to the ecosystems of these organisms. They can provide food for rats and insects. Humans can also water the plants"
Paraphrase that as you will.
Answer:
Yes, because these organisms likely depend on each other for survival. For example, plants and grasses can make food for insects and other small animals, such as rats. Carnivores can eat the small animals and obtain energy from them. Humans are also living things, sk they contribute to the ecosystems of these organisms. They can provide food for rats and insects. Humans can also water the plants
Explanation:
The divisions of the nervous system that have antagonistic actions, or opposing actions are A) motor and sensory. B) sympathetic and parasympathetic. C) presynaptic and postsynaptic.D) forebrain and hindbrain. E) central nervous system and peripheral nervous system.
Answer:
B) sympathetic and parasympathetic
Explanation:
e autonomic nervous system also called the vegetative nervous system is part of the peripheral nervous system which inervates smooth muscle and glands. Thus, it directly affects the function of internal organs and regulates functions such as the heart rate, digestion, respiratory rate, urination etc. This nervous system control is unconscious.
The autonomic nervous system is divided into: the sympathetic nervous system, the parasympathetic nervous system and the enteric nervous system.
Parasympathetic nervous system works when organism is at rest so it is known as system responsible for "rest and digest functions". On the other hand, sympathetic nervous system works at active and stressful situations and it is known as "fight and flight" system.
How does an autotroph differ from a heterotroph?
Autotrophs are able to synthesize their own food by photosynthesis. Heterotrophs cannot synthesize their own food so they must obtain from the environment. Examples include animals, fungi, ameobazoans, etc
There is a liquid capsule inside a cup full of liquid. The cup full of liquid has salt in it and the liquid capsule has no salt in it. In which direction will the solvent flow?
A. From the capsule to the larger cup
B. From the larger cup to the capsule
C. Equally between the capsule and the cup
D. The salt does not have to move
Answer:
A. From the capsule to the larger cup
Explanation:
Solvent movement occurs from region of higher concentration to that of its lower concentration. In the given example, the liquid capsule has higher solvent concentration since it does not have solute. Presence of solute in larger cup makes it hypertonic solution with respect to the liquid inside cup. Hence, solvent will move from hypotonic solution (liquid in capsule) to hypertonic solution.
The solvent, which is water, will move from the larger saltwater-filled cup to the capsule with no salt, due to osmotic pressure driving water towards the higher concentration of solutes inside the capsule.
Explanation:The direction in which the solvent will flow when there is a liquid capsule with no salt in it inside a cup full of salt-containing liquid is based on osmotic principles. The solvent, in this case water, will naturally move from an area of higher water concentration to an area of lower water concentration in an attempt to equalize the solute concentration on both sides of the membrane. Since the liquid inside the capsule has no salt, it has a higher water concentration compared to the saltwater in the cup. Therefore, the correct answer is:
B. From the larger cup to the capsule
This is due to the osmotic pressure that drives water towards the area with a higher concentration of solutes, which would be the inside of the salt-free capsule. The process of water moving across a semipermeable membrane from a less concentrated solution to a more concentrated solution is known as osmosis.
Which characteristic cannot be inherited?
A. The ability to win a soccer game.
B. Length in fur in dogs.
C. Shape in ears of pigs.
D. Height of stem in a sunflower plant.
Answer:
A
Explanation:
You cannot inherit the ability to win a soccer game. Your skills are different from your parents, etc ;)
Ciprofloxacin inhibits DNA gyrase, a bacterial topoisomerase that cuts DNA ahead of the replication fork, winds the DNA in a direction that relieves the twists added during DNA synthesis, and then reseals the DNA. In ciprofloxacin-treated bacteria, newly synthesized DNA is found in fragments. Based on this evidence, what activity of DNA gyrase is likely to be inhibited by ciprofloxacin? ligase activity. DNA polymerase activity. primase activity. helicase activity
Answer:
ligase activity
Explanation:
This is because ligase has the role to connect DNA fragments.
DNA gyrase is one of the enzymes involved in prokaryotic DNA replication. It introduces negative supercoils into DNA and for this process ATP is required. This enables the process of replication to continue.
Will give brainliest answer and lots of points.
Does anyone know the answers for Connexus "Biology B: Unit 5: Lesson 2: Biology semester B test?"
While specific test answers cannot be provided, studying resources such as OpenStax's 'Concepts of Biology' and Kamala Doršner's 'Essentials of Environmental Science' can help build the necessary knowledge for a Biology semester B test.
Explanation:As a tutor, I cannot provide specific answers to test questions from Connexus Biology B: Unit 5: Lesson 2: Biology semester B test or any other test, as it would be against educational policies and ethical standards. However, you can enhance your understanding of the topics by studying related materials from reputable sources. For instance, the OpenStax College resource, Concepts of Biology, can be very helpful as it covers fundamental biological concepts and is available under a Creative Commons license.
Essential topics such as human biology, chemistry of life, nutrition, cells, and DNA and protein synthesis are all crucial for a strong foundation in biology. Reviewing these chapters and using other supplied resources like Essentials of Environmental Science by Kamala Doršner or the video on Branches of Biology can increase your comprehension and prepare you for the types of questions that may appear on your test.
I also recommend focusing on developing a deeper understanding of the material by engaging with the AP Biology Curriculum Framework, posing scientific questions for cause-and-effect relationships, and practicing with test banks that correlate questions to varying levels of Bloom's Taxonomy for a comprehensive study approach.
What is the number of oxygen atoms in molecular oxygen and in ozone.
three
Ozone (O3) is a triatomic, molecule, consisting of three oxygen atoms. Ozone in the upper atmosphere protects living organisms by preventing damaging ultraviolet light from reaching the Earth's surface. O3 is the formula for ozone. It has three oxygen atoms.
Hope this helps:)
If the binding of the CAP-cAMP complex promotes transcription of the induced lac operon, then how does the negative control of the lac operon by glucose function through the CAP-cAMP complex? See Section 18.3 (Page 373) . When glucose concentration is high, the concentration of CAP and the complex are high. When glucose concentration is high, the concentration of CAP and the complex are high. When glucose concentration is high, the concentration of cAMP and the complex are low. When glucose concentration is high, the concentration of cAMP and the complex are high.
When glucose concentration is high, the concentration of cAMP and the complex are low.
If blonde hair is dominant and designated as "b" and brunette hair is recessive and designated as "b," probability would predict that if a couple each with a "bb" hair color genotype had four children, _____ would have blonde hair.
Plummet squares help here: 4 children and dominant so 75% would probably have blonde hair. Sorry if it is wrong there are no answer choices so...
~ Destiny ^_^
If both parents were to pass on their brunette hair genes (with genotype 'bb') all their children will have brunette hair given that brunette is the recessive trait and can only be expressed when both genes are present.
Explanation:In genetics the dominant trait is the one that will appear even if an individual only has one copy of the dominant gene (in this case, blonde hair). The recessive trait (brunette hair in this case) will only appear if the individual has two copies of that gene. In the scenario presented both parents have the recessive brunette gene hence the genotype is 'bb' for both. Given this information if a couple each with a 'bb' hair color genotype had four children all these children would inherit the 'bb' genotype. Therefore assuming the traits for hair color follow simple Mendelian inheritance all children would be expected to have brunette hair. It's important to highlight that environmental factors and the possibility of mutations could potentially influence these outcomes to some extent but that's beyond the scope of this question.
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A scientist investigated DNA replication in two groups of cells, labeled A and B. She injected radioactively labeled nucleotides into cells of each group and allowed DNA replication to begin. When replication was halfway completed, she injected a drug into the cells to stop replication. She then examined the cells to determine the distribution of the newly-synthesized DNA. She found each cell of group A had many segments of new DNA in its nucleus, while each cell of group B had a single segment of new DNA in its cytoplasm. What can the researcher conclude about the cells? A. Group B cells are eukaryotic because they must have a single origin of replication. B. The cells in group A are eukaryotic because they replicate their DNA in the cytoplasm or nucleus. C. Group A cells are prokaryotic because they must have many origins of replication. D. The cells in group B are prokaryotic because they replicate their DNA in the cytoplasm.
Answer:
D. The cells in group B are prokaryotic because they replicate their DNA in the cytoplasm.
Explanation:
The cells of group A are prokaryotic because it is prokaryotes which do not have a double membranous structure called nucleus for storing their genetic material. The genetic material of prokaryotes is spread in the cytoplasm in the form of a circular DNA which is called as nucleoid. Since they do not have a separate organelle like nucleus for storage of their genetic material, they are bound to replicate their DNA in the cytoplasm. In contrast to prokaryotes, eukaryotes have nucleus for storage of their genetic material and in eukaryotes replication is an exclusively nuclear event.
Answer:
D is correct
Explanation:
What are the benefits of cyclic electron flow in photosynthesis?
Result in the formation of ATP
Which of the following is NOT a major urine formation process?A) tubular secretionB) micturitionC) glomerular filtrationD) tubular reabsorption
Answer:b
Explanation:the others don’t make sense
What are the roles of producers consumers and decomposers in an ecosystem
Answer: The producers refers to green plants that carry out the process of photosynthesis in order to produce food for themselves and others. The principal function of producers is to manufacture food for themselves and all other living organisms.
The consumers refers to those living organisms that can not produce their own food and have to depend on the food produce by others. Consumers can be categorized into primary, secondary and tertiary consumers depending on where they are located on the trophic levels. They can also be classified as herbivores, carnivores and omnivores depending on the type of food they eat. The major function of consumers is transference of energy. Consumers transfer the energy they obtain from the food they eat to those animals that feed on them.
The decomposers are those micro organisms that are majorly found in soils.The principal function of decomposers is to break down dead organic matters so that they can be absorbed by the roots of plants. The broken down organic substances serve as nutrients, which the plants used to grow and develop.
These three types of organisms work together in the ecosystem to maintain the balance of the ecosystem.
Kisspeptin is a protein in humans that has an important role in initiating secretion of the releasing factor gonadotropin-releasing hormone (GnRH). Endocrinologists are finding that the protein kisspeptin and its receptor are central to sexual maturation at puberty. Neurons that release kisspeptin carry estrogen receptors. If this is a negative feedback system, high levels of estrogen would be expected to: decrease kisspeptin synthesis. increase kisspeptin synthesis. neither increase nor decrease kisspeptin synthesis because steroid hormones do not affect protein synthesis.
Answer:
decrease kisspeptin synthesis
Explanation:
Kisspeptin is a protein involved in the regulation of gonadotropin-releasing hormone (GnRH): it stimulates the secretion of GnRH. GnRH than stimulate the release of gonadotropins such as follicle-stimulating hormone (FSH) and luteinizing hormone (LH) from the anterior pituitary gland. FSH stimulates the production of estrogens by the granulosa cells of the ovarian follicles.
In negative feedback system, high levels of estrogen will bind to their receptors on neurons that release kisspeptin and inhibit its further release.
High levels of estrogen would decrease kisspeptin synthesis in a negative feedback system by signaling the body to maintain hormone balance.
Explanation:If kisspeptin neurons have estrogen receptors and are part of a negative feedback system, then high levels of estrogen would be expected to decrease kisspeptin synthesis. This is because in a negative feedback system, when the levels of a hormone (in this case, estrogen) are high, it typically signals the body to reduce the production of the hormone or the initiators of its production to maintain homeostasis. Therefore, in this scenario, increased estrogen would lead to a decrease in kisspeptin production, which in turn would lead to a decrease in the release of gonadotropin-releasing hormone (GnRH), ultimately reducing the secretion of gonadotropins like Follicle-Stimulating Hormone (FSH) and Luteinizing Hormone (LH).
Which of these glands secrete a fluid that neutralizes acidity in the surroundings to help sperm survive?
Prostate gland
Cowper's glands
Bulbourethral glands
All of the above
Answer:
Prostate gland
Explanation:
Prostate gland is an exocrine gland of the male reproductive tract that secretes alkaline fluid which is about 30% of seminal fluid. The role of the prostate and its secretion is to nourishes and protects sperm.
This gland vary in size and vary in secretions among different species.
The activity of the prostate is under the control of hormones, mostly testosterone (its metabolite dihydrotestosterone), produced by the testicles.
Answer:
The correct answer is ALL OF THE ABOVE
Explanation:
You perform a series of experiments on the synthesis of the pituitary hormone prolactin, which is a single polypeptide chain 199 amino acids long. the mrna coding for prolactin is translated in a cell-free protein synthesizing system containing ribosomes, amino acids, trnas, aminoacyl-trna synthetases, atp, gtp, and the appropriate initiation, elongation, and termination factors. under these conditions, a polypeptide chain 227 amino acids long is produced.
Answer:
the answer is dont look it up anymore figure it out
Explanation:
explain why excretion in plants is not as elaborate as excretion in animals
Because u can’t take stuff out of animals
The respiratory epithelium of the conducting airways consists of
Answer(nasal cavity, trachea, bronchi and bronchioles
Explanation:
25 points each!!
How might an organism benefit by carrying out fermentation instead of cellular respiration?
Answer:
it gives you more energy quicker
Explanation:
Fermentation makes it possible for cells to continue generating ATP through glycolysis.
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The thick muscular layer of the uterus is the
The thick muscular layer of the uterus is known as the myometrium. It is the middle and thickest layer of the uterus wall and is made up mostly of smooth muscle.
What is the function of the myometrium?The function of the myometrium is that it generally holds the structural integrity of the uterus. It also generates force for parturition with the help of smooth muscle cells, components of the myometrium.
There are three different layers of the uterus are there. The outermost layer is known as the Perimetrium. It is the protective layer of the uterus.
The second layer is known as the myometrium which expands during pregnancy and contracts to push the baby out at the time of delivery. The inner layer of the uterus is known as the endometrium.
Therefore, the myometrium is the thick muscular layer of the uterus.
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The thick muscular layer of the uterus is known as the myometrium. This layer, part of the three-layered structure of the uterus wall, is responsible for uterine contractions. The uterus supports the developing embryo and fetus during pregnancy.
Explanation:The thick muscular layer of the uterus is the myometrium. The uterus wall is structured into three layers. The innermost layer is the endometrium, rich in blood vessels and mucus glands. The outermost layer is the perimetrium, a serous membrane composed of epithelial tissue. The myometrium, the middle layer, is a thick layer of smooth muscle responsible for uterine contractions during labor and menstrual cycles.
Contractions in the myometrium possibly also facilitate the transport of sperm through the female reproductive tract. The structure of the uterus, about the size of a woman's fist, plays a vital role in supporting the developing embryo and fetus during gestation.
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Consider a population of killer whales. The gene pool of this population would only contain alleles harboring beneficial or neutral mutations, as deleterious mutations are efficiently eliminated from the gene pool of a species.FalseTrue
Answer:
The statement given in the question is FALSE.
Explanation:
The gene pool of all populations of living organisms contain alleles that habour beneficial, harmful and neutral mutations and any of these mutations can be expressed at anytime. A mutation is said to be beneficial if it increases the ability of the organism to survive; it is described as neutral if it does not impact any change. A harmful mutation on the other hand is one that impact the living organism negatively.
What would be the drug of choice in an adolescent who is diagnosed with syphilis during the first trimester of pregnancy?
Answer:
Penicillin G
Explanation:
I remember this vaguely, remove or whatever if wrong.
Ellis-van Creveld syndrome is a rare homozygous recessive disorder that affects bone growth. Individuals with this disorder are characterized by dwarfism, polydactyly, heart defects, and other symptoms. The recessive allele that causes it is extremely common in the Amish community of Lancaster County, Pennsylvania, and in the indigenous population of Western Australia. For example, the birth rate of this disorder in Lancaster County is 1 in every 5000 births ( compared to 1 in every 150,000 births worldwide). a) Approximately what percent of the Amish population are heterozygous carriers of the allele for Ellis-van Creveld syndrome? b) What percentage is homozygous dominant?
Answer:
1. 2.8%
2. 97.1%
Explanation:
If the birth rate of this disorder is 1 in every 5000 births it means that the frequency of the recessive homozygous genotype is 1/5000=0.0002If we name the gene for the disorder with A, than the genotypes are aa (homozugous recessive), Aa (heterozygous, carrier), AA (dominant homozygous).
According to the Hardy-Weinberg equation:
frequency of AA is p2 (P)
frequency of Aa is 2pq
frequency of aa is q2 (Q) and
p2+2pq+q2=1 (P+Q=1)
Q=0.0002 P=1-0.0002=0.9998
q= [tex]\sqrt[/tex]0.0002=0.014
p=[tex]\sqrt[/tex]0.9998=0.999
2pq=0.028=2.8%
2. According to the Hardy-Weinberg equation:
frequency of AA is p2 (P)
frequency of Aa is 2pq
frequency of aa is q2 (Q) and
p2+2pq+q2=1 (P+Q=1)
The frequency of the recessive homozygous genotype (Q) is 1/5000=0.0002
Q=0.0002
q2=0.0002 2pq=0.028 p2=?
p2= 1-0.0002-0.028 =0.9718=97.1%
Final answer:
Approximately 0.1% of the Amish population are heterozygous carriers of the allele for Ellis-van Creveld syndrome, and approximately 99.2% are homozygous dominant.
Explanation:The percentage of the Amish population that are heterozygous carriers of the allele for Ellis-van Creveld syndrome can be estimated using the Hardy-Weinberg equation. The formula for heterozygote frequency is 2 * p * q, where p represents the frequency of the dominant allele and q represents the frequency of the recessive allele. In this case, since the disorder is rare and the recessive allele is common in the Amish population, we can assume that [tex]q^2[/tex] quals the frequency of the disorder in the population. The frequency of the recessive allele, q, is then the square root of [tex]q^2[/tex]which is 1 in every 200 births. Thus, the frequency of the dominant allele, p, is 1 - q, which is 1 - (1/200) or 199/200. The heterozygote frequency is 2 * p * q, which is 2 * (199/200) * (1/200) or approximately 0.1%.
The percentage of the Amish population that is homozygous dominant can be estimated by squaring the frequency of the dominant allele, p. In this case, p is 199/200, so the homozygous dominant frequency is [tex](199/200)^2[/tex]ately 99.2%.
The membrane surrounding the ovary is the tunica albuginea. True or False
The answer to your question is true.
The membrane surrounding the ovary is the tunica albuginea. - False
Explanation:The membrane surrounding the ovary is not the tunica albuginea. It is called the ovarian capsule or ovarian cortex. The tunica albuginea is a dense connective tissue layer that surrounds certain other organs, such as the testes in males. In the case of the ovary, the ovarian cortex is beneath the tunica albuginea, and it contains the ovarian follicles where eggs are produced and stored.
So, while the tunica albuginea is an important structure, it is not the membrane that directly surrounds the ovary. The tunica albuginea actually refers to a dense connective tissue layer that surrounds certain organs, such as the testes and ovaries. In the case of the ovary, the membrane that surrounds it is called the tunica albuginea is not. It is actually called the germinal epithelium.
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Click on the sentence that uses hyphens correctly. choose one answer.
a. many fast food chains are trying to reduce the amount of saturatedâ - fat,â calories, and cholesterol in their food.
b. many fastâ - foodâ - chains are trying to reduce the amount of saturatedâ fat, calories, and cholesterol in their food.
c. many fastâ - food chains are trying to reduce the amount of saturatedâ fat, calories, and cholesterol in their food.
It's C that's correct. This sentence uses hyphens correctly...
The Indian leaf butterfly has traits that allow it to resemble a leaf. The bright colors of the monarch butterfly indicate that the butterfly tastes bad and can be poisonous. How does the appearance of these butterflies help them to survive?
Answer:
The bright colors act as a warning
Explanation
Bright colors on an animal are typically a sign that an animal is poisonous, such as the colors on a poison dart frog.
Answer:
The Indian leaf butterfly is able to avoid predators while the monarch butterfly warns predators awa
Explanation:
Which noncoding RNAs are correctly matched with their function?a. Piwi-associated RNAs (piRNAs) reestablish appropriate methylation patterns in the genome during gamete formation.b. Small interfering RNAs (siRNAs) bind to complementary sequences in mRNA and block its translation.c. MicroRNAs (miRNAs) bind to complementary sequences in mRNA and block its translation.
Answer:
all 3
Explanation:
What statement does NOT pertain to the cephalic phase of gastric secretion? (It controls the rate at which chyme enters the small intestine., It is triggered by sensory input, such as sight, as well as mental input, such as thinking about food., Mucous cells, chief cells, parietal cells, and G cells receive signals through the submucosal plexus., It usually lasts only a few minutes.)?
Answer:
It controls the rate at which chyme enters the small intestine
Explanation:
Cephalic phase is one of the phase of gastric secretion (other two are gastric phase and intestinal phase) that begins even before food enters the oral cavity. Thinking of food stimulates the release of gastric juice via parasympathetic nervous system). Food that enters the stomach also stimulates the secretion of gastric juice by parietal cells. Partially digested food directly activates G cells (Enteroendocrine cells) to secrete gastrin which also stimulates the release of gastric juice.
The statement incorrectly associated with the cephalic phase of gastric secretion is that it controls the rate at which chyme enters the small intestine; this is actually part of the intestinal phase.
Explanation:The statement that does NOT pertain to the cephalic phase of gastric secretion is "It controls the rate at which chyme enters the small intestine." This particular function is a component of the intestinal phase of gastric secretion, which begins when chyme enters the small intestine, triggering a myriad of digestive secretions and coordinating the activities of the intestinal tract, pancreas, liver, and gallbladder. Conversely, the cephalic phase precedes food entering the stomach and is initiated by sensory and mental stimuli such as the sight or thought of food, which through the central nervous system, stimulates the secretion of gastric juices in preparation for digestion. The cephalic phase engages mucous cells, chief cells, parietal cells, and G cells through signals transmitted via the submucosal plexus and is typically of short duration.
Sometimes critics charge that evolution is based on mere speculation because it cannot be directly observed or experimentally induced. Is this true of evolution by natural selection?
Answer:
False
Explanation:
When scientists speak of evolution as a theory they do not mean that it is a mere speculation. It is a theory in the same sense as the propositions that the earth is round rather than flat or that our bodies are made of atoms are theories. Most people would consider such fundamental theories to be sufficiently tested by empirical evidence to conclude that they are indeed facts. As a result of the massive amount of evidence for biological evolution accumulated over the last two centuries, we can safely conclude that evolution has occurred and continues to occur. All life forms, including humans, evolved from earlier species, and all still living species of organisms continue to evolve today. They are not unchanging end-products.
Evolution by natural selection is one of the best substantiated theories in the history of science, supported by evidence from a wide variety of scientific disciplines, including paleontology, geology, genetics and developmental biology.
The assertion that evolution by natural selection is based purely on speculation is not accurate. In science, the 'theory of evolution' is a thoroughly validated explanation of natural events that have been extensively tested and supported over time. Although large-scale evolutionary changes, like the formation of new species, occur over periods longer than a human lifespan and can't be directly observed, we have indeed witnessed instances of evolutionary processes.
Explanation:The criticism that evolution by natural selection is based on mere speculation and cannot be experimentally induced or directly observed is a misunderstanding of what a scientific theory represents. In scientific terms, a theory like the 'theory of evolution,' is a well-founded explanation of natural phenomena that has been tested and validated over time.
It's not 'just a theory' in the everyday vernacular sense of a guess or speculation. In fact, there is extensive support for this theory in multiple fields of science, including genetics, paleontology and biogeography. Further, the majority of working scientists back the theory of evolution.
When critics claim that evolution is not observable, it's essential to clarify that while we cannot directly observe large-scale changes like the formation of new species (since it happens over extended periods), we indeed can and have observed instances of evolutionary processes, such as antibiotic resistance in bacteria and changes in species in response to environmental pressures.
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