Answer:
c. Some codons specify the same amino acid.
Explanation:
Codons are triplets of nucleotides in mRNA that is used for the protein synthesis (translation). A codon specifies a single amino acid, but there are exceptions. tRNA molecule contain anticodons, triplets of nucleotides that are complementary to codons. So, during the translation, tRNA carries the amino acid, that corresponds to the codon in mRNA.
The correct statement about the genetic code is: c. Some codons specify the same amino acid. This is because multiple codons can specify the same amino acid due to the degeneracy of the genetic code. No single codon can specify more than one amino acid and every codon has a function either as an amino acid or a stop signal.
Explanation:The subject of this question is the genetic code and how it translates into amino acids. The correct statement about the genetic code is c. Some codons specify the same amino acid. This is due to the genetic code's degeneracy, which allows for the specification of the same amino acid by several codons. For instance, there are six distinct codons that can specify the amino acid leucine. However, no single codon can specify more than one amino acid, making the option wrong. Every codon does have a function as either an amino acid or as a stop signal in protein synthesis, making option d incorrect as well.
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Which pregnancy-specific structure is responsible for delivering nutrients and oxygen to the fetus and removing waste products? which pregnancy-specific structure is responsible for delivering nutrients and oxygen to the fetus and removing waste products? blastocyst placenta uterus amniotic fluid?
Answer:
Blastocyst placenta.
Explanation;
During pregnancy the fetus depends on its mother for nourishment and oxygen since it cannot breathe air it's blood circulates differently than it does after birth.Due to the circumstances stated above the mothers womb develops an organ known as the placenta that develops and implants in the mother's womb during pregnancy to provide oxygen and nutrients to the growing baby and remove waste products from the baby's bloodThe fetus is connected to the placenta by the umbilical cord which contains blood vessels that transport nutrients and oxygen from the mothers blood to the baby and also transports waste products and carbon dioxide from the baby to the placenta and then to the mothers circulatory system to be eliminated.The placenta is the pregnancy-specific structure that delivers oxygen and nutrients to the fetus and removes waste products.
The structure responsible for delivering nutrients and oxygen to the fetus and removing waste products is the placenta. The placenta is a unique, temporary organ that connects the developing baby to the mother, enabling the transfer of oxygen and nutrients into the fetus's bloodstream while also allowing for the elimination of waste products. This exchange occurs through the umbilical vein and arteries: oxygen-rich blood is carried to the fetus via the umbilical vein, and oxygen-depleted blood, along with wastes, returns to the placenta through the umbilical arteries.
A particular E. coli cell contains a lac operon that continuously breaks down lactose into glucose and galactose. What could be a possible explanation for this occurrence? Select one: a. Beta-galactosidase is being inhibited by an allosteric inhibitor. b. The I gene in the lac operon is mutated and does not encode for the lac repressor. c. This particular E. coli cell does not use glucose as a viable sugar source. d. The lac repressor has a mutation in the lactose binding site. e. The operator has a mutation that does not allow the RNA polymerase to bind to it.
Answer:
b
Explanation:
i think
What male reproductive gland is missing in the cat
Answer:
Seminal vesicles
Explanation:
The seminal vesicles also called vesicular glands are found only in some mammals. Those are paired tubular glands within the pelvis with the function to secrete fluid that will become the semen.
Male cat does not have a seminal vesicle, but do have other accessory glands that secrete the seminal fluid such as prostate gland and Cowper´s (bulbourethral) glands.
The picture below shows what kind of plant root?
A.) adventitious root
B.) fibrous root
C.) taproot
D.) vascular root
The picture below shows taproot.
Hope this helps chu
Have a great day
Answer: C.) taproot
Explanation:
A taproot is the large penetrating cylindrical root. It grows vertically downwards and small lateral roots comes out from the sides of the large, broad cylindrical root. It is somewhat more straight, thick and tapering at the ends. They penetrate deep into the soil so as to absorb maximum water.
The base of the pyramid is built from organisms that primarily A) are autotrophs. B) are heterotrophs. C) consume organisms located above them.
The base of the pyramid is built from organisms that primarily are autographs.Answer: A
Give 5 examples of adaptations birds have acquired and explain how they contribute to their ability to fly
Why does weather vary from day to day? A. Because the rotation of the Earth causes the atmosphere to expand and contract as it nears the Sun or Moon B. Because weather is a complex interaction among many different variables that are constantly changing C. Because cold fronts are always followed by a series of colder fronts, before a warm front returns D. Because the Sun's energy heats all parts of the Earth evenly but does not heat the atmosphere
Answer:
B. Because weather is a complex interaction among many different variables that are constantly changing
Explanation:
Final answer:
Weather varies daily due to the complex interplay of many changing variables, mainly the uneven heating of the Earth's atmosphere by the sun, which results in differences in temperature and ultimately leads to differing weather conditions. Option B is correct.
Explanation:
The reason why weather varies from day to day is B. Because weather is a complex interaction among many different variables that are constantly changing. Weather can change because of the unequal heating of the atmosphere by the sun, which is influenced by factors such as the earth's rotation, surface features, cloud cover, and the distance from the equator. The differential heating of the Earth's surface leads to temperature differences that cause air to move and form winds, and these movements result in various weather conditions like clouds and rain.
Uneven heating causes warm air, which is less dense, to rise and be replaced by cooler, more dense air. This sets up wind patterns that move weather systems around the globe. Furthermore, the Coriolis effect, due to Earth's rotation, influences the movement of these air masses and contributes to the variability of weather.
Variables such as atmospheric pressure, humidity, the presence of ocean currents, and geographic location also play a critical role in the day-to-day changes in weather. In simpler terms, the energy we get from the sun doesn't distribute evenly across the globe, creating areas with different temperatures and atmospheric conditions which change as the Earth rotates and orbits the sun.
The _______ biome contains more dissolved minerals than the freshwater biome.
taiga
desert
marine
tundra
Answer:
The marine biome contains more dissolved minerals than the freshwater biome.
Explanation:
The marine biome is salted by the concentration of dissolved mineral salts it contains, 35 ‰ on average. The average surface density is 1,025 g / ml, being denser than fresh water and pure water.
Answer:
marine
Explanation:
In lacI —mutant cells, when there are high levels of glucose present but no lactose, how much β-galactosidase will be produced? See Section 18.2 (Page 371) . View Available Hint(s) In lacI —mutant cells, when there are high levels of glucose present but no lactose, how much β-galactosidase will be produced? See Section 18.2 (Page 371) . A low amount A great deal It depends on what other sugars are present in the growth medium. Essentially none
In lacI mutant cells with high glucose and no lactose, essentially no β-galactosidase is produced due to the absence of lactose to inactivate the dysfunctional repressor and the presence of glucose which keeps cAMP levels low, resulting in inactivity of the CAP.
In lacI —mutant cells, when high levels of glucose are present and no lactose is available, essentially no β-galactosidase will be produced. This is due to the fact that the lac repressor in a lacI mutant is non-functional, and cannot properly respond to the presence of lactose. However, the presence of high glucose levels prevents the catabolite activator protein (CAP) from enhancing transcription at the lac operon. Essentially, in the absence of lactose, there is no inducer to inactivate the repressor and no β-galactosidase activity. Moreover, high glucose levels decrease the cyclic AMP (cAMP) levels, leading to an inactive CAP which cannot increase transcription of the lac operon. Thus, the concentration of β-galactosidase remains low or nonexistent.
Compare and contrast prokaryotic and eukaryotic cells
Prokaryotes are usually smaller than eukaryotes. They also don’t have a nucleus so DNA is in the cytoplasm. They also have no organelle membranes where as eukaryotes do. Domains of prokaryotes include Bacteria and Archaea, and all eukaryotes are in the domain Eukarya. Both can be free living, but only eukaryotes can be multicellular. Prokaryotes first appeared on earth about 3.5 billions then eukaryotes appeared about a billion years later. Etc....
There are two main types of cells among living organisms:
Eukaryotic cell (plants, animals, fungi) which is more compound, conntains nucleus with genetic material in it, membrane-bound organelles (mitochondria, Golgi apparatus, lysosomes etc). Because of their complex structure, the process within such cells are often more comlex then those in prokaryotes. Eukaryotic organisms are usually multicellularProkaryotic cell is simple cell found in Archea and Bacteria kingdom. It doesn't have nucleus neither membrane-bound organelles. Genetic material of these cell is located within the cytoplasm together with proteins and metabolites. First living cell was prokaryotic cell. Organisms that are prokaryotic are usually unicellular.
Which hormone prevents degeneration of the corpus luteum?
Answer:
hCG
Explanation:
The corpus luteum also called "yellow body" is the remaining of the ovarian follicle that has released a mature egg during a previous ovulation (it develops at each menstrual cycle). The corpus luteum is an endocrine structure which produces of progesterone, estradiol and inhibin A.
If egg released during the ovulation becomes fertilized, human chorionic gonadotropin (hCG) secreted by the cells of the blastocyst signals the corpus luteum to continue progesterone secretion.The role of the corpus luteum is to maintain endometrium of the uterus and provide an area rich in blood vessels for the zygote's development.
On Earth, animals were sorted out by classification. There were many kingdoms that defined whom they were. Which of the following is the most generic classification for animals?
Population
Group
Genus
Species
Answer: Genus
Explanation:
We can automatically cross out "Population" and "Group" because both are not part of the classification system. Species is more specific, so our only answer would be Genus.
Hope this helps ya :D
Why does the left ventricle have a thicker myocardial wall?
Answer:
There are two types of ventricles; the right and the left ventricles. The ventricles are large chambers located in the heart, which receive blood from atria. The major function of the ventricles is to pump blood throughout the body. In order to carry out their function of pumping blood very well, the ventricles have thicker myocardial wall compare to the atria. The thick myocardial walls allow blood to be pumped out of the heart at greater pressures.
The left ventricle has a thicker myocardial wall as it needs to generate substantial pressure to pump blood into the long systemic circuit. The myocardium's structure, including its complex muscle pattern, aids in its functionality. In contrast, the right ventricle services a shorter circuit with less resistance, so it doesn't require as thick a wall.
Explanation:The left ventricle in the human heart is structurally designed to accommodate a higher workload than the right ventricle. Its myocardial wall is thicker because the left ventricle needs to generate a substantial amount of pressure to pump blood into the long systemic circuit. The muscular thickness of the ventricles is directly proportional to the resistance they have to overcome.
Furthermore, the muscle pattern of the myocardium, which forms a complex swirling pattern around the heart chambers, adds to its efficiency. The myocardium is the thickest layer of the heart, made largely of cardiac muscle cells, built on a framework of collagenous fibers, blood vessels, and nerve fibers that regulate the heart.
In contrast, the right ventricle doesn't need to generate as much pressure since the pulmonary circuit it services is shorter and provides less resistance. Therefore, its wall is not as thick as the left ventricle. Hence, the thickness in the myocardial wall of the left ventricle is a structural adaptation to its function and workload.
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The tomato hornworm, Manduca Quinquemaculata,feeds on the leaves and stems of tomato plants, as well as other plants in the nightshade family, like eggplant and Potatoes. you can pick off the horn worms which is time-consuming or you can spray with a pesticide. there is another way to already Eradicate the horn worms as seen here. The white projections are the larvae of the braconid wasp, Cotesia congregatus. larvae that hatch from the wasps eggs which are laid on the horn worm, and then feed on the inside of the horn worm until the wasp is ready to pupate. This method of pest control is called
A. Genetic control
B. Bio magnification
C. Biological control
D. Pheromone application
Answer:
C.
Explanation:
biocontrol is a method of controlling pests by the introduction of a natural enemy or predator.
Answer:
C. Biological control
Explanation:
Biological control of pest uses any living organisms or their products to reduce the harmful effects of pests. In the given example, tomato hornworm, which is pest on tomato plant, is controlled by use of larva of braconid wasp. The larva feed on inside of the hornworm. Hence, it is an example of biological controls.
Which of the following statements correctly describes the effect a nonsense mutation would have on a gene?a) It changes an amino acid in the encoded protein.b) It alters the reading frame of the mRNA.c) It introduces a premature stop codon into the mRNA.d) It has no effect on the amino acid sequence of the encoded protein.
Answer:
c) It introduces a premature stop codon into the mRNA
Explanation:
Nonsense mutation is a type of point mutation (single nucleotide base is changed) which leads to premature stop codon. Stop codons are also called nonsense codons and that is way this type of mutation is called nonsense mutation. As a consequence, synthesized protein is incomplete and shorter than it should be (truncated protein), usually nonfunctional.
Hershey and Chase set out to determine what molecule served as the unit of inheritance. They completed a series of experiments in which E. coli was infected by a T2 virus. Which molecular component of the T2 virus actually ended up inside the cell?A) proteinB) RNAC) ribosomeD) DNA
Answer:
The correct option is D.
Explanation:
In the year 1952, two scientists, Hershey and Chase conducted a series of experiments that helped to establish the fact that DNA is a genetic material. The DNA is located inside the nucleus of living cells in form of chromosomes and its the determinant of traits that are found in living organisms. During protein synthesis, the information in the DNA molecule is encoded into an RNA molecule and this is used in the production of protein, thus, DNA actually directs all the happen in the living cells.
Hershey and Chase conducted an experiment in 1952 that proved DNA is the molecule carrying genetic information. They demonstrated this by infecting E. coli cells with T2 bacteriophage - a virus - and discovered that only the DNA from the bacteriophage ended up inside the cells.
Explanation:The answer to your question lies in a series of experiments conducted by Alfred Hershey and Martha Chase in 1952. They were investigating the molecular component of the T2 bacteriophage, a type of virus, that ended up inside E. coli cells it infected.
Using two separate batches of phage, they used radioactive sulfur, ³⁵S, to label the protein coats of one batch, and radioactive phosphorus, ³²P, to label the DNA of the other batch. After infection, they separated the phage and cells and discovered that only the phage batch radiolabeled with ³²P ended up inside the bacterial cells. This confirmed that it was the DNA, not protein, that was injected into the cell and served as the genetic material.
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17. For a virus, what advantages and disadvantages does the lytic lifecycle have compared with the lysogenic lifecycle? A. The lytic lifecycle allows a virus to wait until conditions are optimal before reproducing but also gives the host cell more time to detect and fight the virus. B. The lytic lifecycle ensures that the virus won't be detected by the host cell but also kills the host and forces the virus to find a new host cell. C. The lytic lifecycle allows viruses to reproduce more quickly but also kills the host and forces the virus to find a new host cell. D. The lytic lifecycle allows viruses to reproduce when the host cell reproduces, spreading to its daughter cells, but also gives the host cell more time to detect and fight the virus. Mark for review (Will be highlighted on the review page)
Answer:
C. The lytic lifecycle allows viruses to reproduce more quickly but also kills the host and forces the virus to find a new host cell.
Explanation:
The lytic lifestyle of the viruses (e.g. bacteriophage) can be described through the next steps:
attachment and injection into the host cell (e.g.bacterial cell)synthesis of the early virus proteins which break down host's DNAvirus uses host's machinery (for the replication, transcription and translation) to produce the rest of its proteins and to form new virus particles.host cell burst and many new virus particles are released.During the lysogenic cycle, virus does not kill the host. It integrated its DNA into host's genome and stays dormant until conditions are optimal for reproduction.
Answer:c
Explanation:
Choose the best definition of allele.
A. One of several possible versions of a gene, which each produce a different phenotype
B. The process of fertilizing a plant with pollen from another plant
C. A set of genes that are located on the same chromosome and so are tightly linked
D. An organism that's purebred for a given trait
Answer:
A.
Explanation:
An allele is a variant form of a given gene.
Answer:
The correct answer is option A. one of several possible versions of a gene, which each produce a different phenotype.
Explanation:
The variant forms of a particular gene which form different phenotype are known as an allele. Alleles can be dominant or recessive in nature.
If any organism is heterozygous than the dominant allele will be expressed phenotypically.
Thus, the correct answer is an option is A.
The _______ vein can be used for venipuncture in nearly all species of animals.
a. femoral
b. coronary
c. saphenous
d. jugular
Answer:
the answer is d.jugular
Explanation:
me and my fellow classmates just went over this
A half-life of a radioactive substance is the amount of time needed for one half of _____ to decay into a stable isotope.
the neutrons in the nuclei
its beta particles
the nuclei in a sample
Answer:
its the nuclei in a sample
Explanation:
Answer: The correct answer is the nuclei in a sample.
Explanation:
Half life is defined as the time taken for half of the reaction to complete. This is also defined as the time in which the concentration of a reactant is reduced to half of its original value.
General expression for half life period of a reaction for nth order is: [tex]t_{1/2}=\frac{1}{[A_0]^{n-1}}[/tex]
where, n = order of the reaction
Hence, the correct answer is the nuclei in a sample.
Taste buds are the sensory structures found on certain?
The tongue is the muscle from which an animals/human taste sense comes from. It is covered in taste buds, a special nerve sensor to only the tongue.
What is sensory system?A sensory system is defined as the sensory neurons, neural pathways, and parts of the brain which involved in sensory perception.
Commonly recognized sensory systems are those for hearing, vision, touch, smell, taste, and balance.
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Taste buds are sensory structures on the tongue responsible for the sense of taste. They consist of chemoreceptor cells, each sensitive to different taste qualities such as sweet, salty, sour, bitter, and umami, and relay information to the brain.
Taste buds are the sensory structures found on certain raised bumps on the tongue, known as papillae. These buds are primarily located on the tongue and are composed of chemoreceptor cells (gustatory, sustentacular, and basal cells) that sense and transmit the sensation of taste to the brain. Taste receptors within these buds make contact with chemicals in food through taste pores. When chemicals bind with these cells, nerve impulses travel to the central nervous system (CNS). The tongue has different receptor types for detecting sweet, salty, sour, bitter, and umami (meaty or savory) tastes, activating sensory neurons that communicate with the brain.
Which of these is unique to flowering plants?haploid gametophytes,an embryo surrounded by nutritive tissue,double fertilization,a dominant sporophyte generation,pollen production
Answer:
double fertilization
Explanation:
Flowering plants or angiosperms are seed-producing plants with the ability to produce reproductive organs-flowers and fruits with seed in it (unlike gimnosperms which contain naked seed). Another distinctive feature of angiosperms is their reduced gametophytes. This feature most likely reduces the time between pollination and fertilization. Fertilization in flowerin plants is double, meaning that two sperm cells fertilize ovule cells(egg cell and central nuclei cell): one forms diploid zygote which will develop in embryo, while other form triploid cell which will develop into endosperm (provides nutrition for the embryo).
Answer:
Double fertilization
Explanation:
In flowering plants, one sperm nucleus fertilizes the egg and other sperm nucleus fuses with two other nuclei found within the ovule—thus forming triploid endosperm.
If you eat food while hanging upside down, do you think it will still go through the alimentary canal? Give Reasons...
Answer:
Our alimentary canal undergo a process or a movement called peristalsis, in which the walls continuously move to pass the food downwards. So if you eat hanging upside down, the food would surely move.
Explanation:
Peristalsis is a series of wavelike muscle contractions that moves food to different processing stations in the digestive tract and the process begins in the oesophagus when a bolus of food is swallowed.The muscles of the oesophagus are strong enough to propel food and liquids into the stomach even when hanging upside down although there is a risk of chokingIt is advised that maintaining a correct body positioning during eating is very important for digestion to happen properly and avoid blockage of the airways by food and fluid.Leaning your body upright slightly and rounding your shoulders a bit so that your chin is tucked-up is a way of exercising safe chewing and swallowing.A lorazepam injection contains 4 mg of lorazepam per milliliter. calculate the ratio strength of lorazepam in the injection. (answer must be numeric; no units or commas; do not enter the 1 and the colon; enter only the number after the colon, as shown here with xs: 1:xxx.)
Answer:
D. Temazepam
Explanation:
A lorazepam injection contains 4 mg of lorazepam per milliliter. The ratio strength of lorazepam in the injection is 250.
What are the uses of lorazepam?Lorazepam, sold under the brand name Ativan among others, is a benzodiazepine medication. It is used to treat anxiety disorders, trouble sleeping, severe agitation, active seizures including status epilepticus, alcohol withdrawal, and chemotherapy-induced nausea and vomiting.
Lorazepam belongs to a group of medicines called benzodiazepines. It's used to treat anxiety and sleeping problems that are related to anxiety. It can be taken to help you relax before an operation or other medical or dental treatment.
Feeling sleepy, dizzy and lightheaded are the most common side effects of lorazepam. Other symptoms include loss of focus and impaired coordination.
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What controls which dna is amplified in pcr?
Answer:
Primers
Explanation:
PCR or Polymerase Chain Reaction is in vitro techinque, widely used for production of DNA copies of a specific DNA region. The major components of this reaction are thermostable enzyme Taq polymerase and primers designed for specif region of DNA that is region of interest.
PCR reaction is repeatedly cycled through a series of temperature changes, and the purpose of it is to make as much amplified DNA sequences for further investigations.
In PCR, the DNA segment that gets amplified is controlled by the sequence of the primers. The thermocycler conducts temperature changes necessary for denaturing, annealing, and extending DNA. Post-PCR, products are checked via electrophoresis and careful practices are essential to prevent contamination.
The process that controls which DNA is amplified in PCR (Polymerase Chain Reaction) is primarily determined by the sequence of the primers used in the reaction. These primers are short pieces of DNA that are designed to be complementary to the specific regions of the template DNA that one intends to amplify. Therefore, by controlling the primers' sequences, experimenters can target exactly what segment of DNA is replicated.
During PCR, thermal cycling is employed to change temperatures in a way that facilitates the replication process. The thermocycler machine is responsible for raising and lowering the temperatures for denaturing the DNA, annealing the primers, and extending the new DNA strands. Each of these steps occurs at a different temperature, with the entire amplification process being completed rapidly.
Post-amplification, the PCR product is typically checked on an electrophoretic gel to confirm the successful amplification of DNA of the expected size. PCR not only allows for selective replication of a specific DNA segment but also requires stringent practices to avoid contamination, which can greatly affect the results due to the high sensitivity and amplification capabilities of PCR.
The lymphatic capillaries function to absorb the excess protein-containing interstitial fluid and return it to the bloodstream. True or False
Answer:
True
Explanation:
The lymphatic capillaries have the role to drain extracellular fluid, more precisely the interstitial fluid that surrounds cells. Lymph capillaries process the interstitial fluid, collect it together with the white blood cells and form a lymph. Formed lymph is then transported into a lymphatic vessel, which is connected to a lymph node. Lymph is at the end returned to the venous circulation.
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Answer:
Explanation:
Left
I think C would be very hard to do. How much study? What is a good person? Still with a lot of careful definitions it might be possible. I wouldn't want to do it however.
I think A would be fun, but what kind of procedure would you set up to try and resolve what it in the box. How would you distinguish between a rattlesnake and a baby rattle? What test could you set up? I think A is the answer and I should come up with a better example. How would you tell the difference between an 8 faced figure and a 12 faced one? You can't open the box and look. So the answer is A.
Middle
You have the right answer of those listed. But Lyell was not the first to make a geological column. Look up Smith.
Right
Same answer as above.
What part of the ear allows air to enter to help equalize pressure on both sides of the tympanic membrane?
Answer:
Eustachian tube
Explanation:
Eustachian tube is the auditory tube, that connects middle ear with nasopharynx. The main role of the Eustachian tube is to regulate and maintain the pressure in the ear (it equalizes the pressure between the middle ear and the atmosphere). The tube is usually closed, but it opens when we swallow and chew. It also opens with positive pressure.
Blockage of the Eustachian tube can lead to discomfort or even hearing problems.
The Eustachian tube is the part of the ear responsible for allowing air to enter the middle ear to equalize pressure on both sides of the tympanic membrane.
The part of the ear that allows air to enter to help equalize pressure on both sides of the tympanic membrane is the Eustachian tube. This tube connects the middle ear with the nasopharynx, which is the upper part of the throat behind the nose. Its primary function is to maintain an equal air pressure on either side of the eardrum, which is essential for proper hearing. The Eustachian tube normally opens when we swallow or yawn, allowing air to pass through and equalize the pressure. Conditions such as allergies or a head cold can cause inflammation, making the Eustachian tube less easily opened and leading to a sensation of pressure, discomfort, or pain due to the unequal pressure against the tympanic membrane.
What would be the most likely result of cutting down a rainforest and planting a coffee crop?
a
a decrease in erosion
b
a decrease in biodiversity
c
an increase in available fresh water
d
an increase in photosynthetic activity
Answer: B
Explanation: A decrease in biodiversity
E. within this feedback loop, do the signals from the response change in magnitude (lesser, greater) or direction (positive, negative)?
Answer
the answer is lesser i did a test on it