Answer:
There is inverse relationship between DDT use and bald issue reproduction
Explanation:
Dichlorodiphenyltrichloroethane, is commonly known as DDT, which is a colorless, tasteless, and almost odorless, crystalline chemical, an organochlor. Originally developed as an insecticide, it is famous for its environmental impact. DDT was synthesized first in 1874 by the Austrian chemist Othmar Zeidler. The breeding of bald eagles in northwest Ontario rose from 1.26 offspring per breeding area in 1966 to a low of 0.46 in 1974 and then rose to 1.12 in 1981. The DDE residues in the added eggs showed a significant inverse relationship, confirming the effects of toxin on population-level bald head reproduction and the effectiveness of the DDT ban. The recovery from DDE contamination in the bald eagle appears to be much faster than expected.
What are the three types of selection pressures that could act and eliminate organisms with undesirable traits
The three types of selection pressures are:
resource availability, environmental conditions, and biological factors
Explanation:
Selection pressures are those external factors which drives the process of natural selection; by influencing the organism’s phenotype by eliminating undesirable traits, or by increasing the favorable traits, so as to increase its ability and adaptability to survive in its environment.
Selective pressures are broadly falls under biotic, abiotic, and neutral factors.
Various selective pressures include competition, predation, diseases and illnesses, sexual selection, pollutants, climate change, parasitism, sunlight, wind, land clearance etc.
These can be broadly classified as resource availability, environmental conditions, and biological factors.
Resource availability in form of food, shelter or habitat, mates etc., are the major selective pressures
Environmental factors like sunlight, wind, weather conditions, climate, pollution; all can influence natural selection
Biotic factors include predators, parasitism, diseases and illnesses etc.
The adaptation of giraffes with long neck and legs are due to selective pressures to reach for food present at higher levels of vegetation.
The three types of selection pressures are stabilizing selection, directional selection, and disruptive selection. These processes favor average traits, one extreme trait, and both extreme traits, respectively, and can eliminate organisms with undesirable traits.
Explanation:There are three main types of selection pressures that can act to eliminate organisms with undesirable traits: stabilizing selection, directional selection, and disruptive selection.
Stabilizing selection favors average traits and works to eliminate extreme variations. For example, in a population of birds, those with average-sized beaks may survive better than those with very large or very small beaks.
Directional selection favors one extreme trait over other variations. For instance, if larger size provides a survival advantage, organisms with smaller sizes will gradually be eliminated from the population.
Disruptive selection favors both extremes of a trait and can lead to a split in a population, potentially leading to the formation of new species. For example, if both small and large beaks provide advantages for different reasons, birds with average-sized beaks might be less likely to survive over time.
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which statement correctly compares and contrast the three stages of cellluar respiration that occurs in the presence of oxygen
Which statement correctly compares and contrasts the three stages of cellular respiration that occur in the presence of oxygen? Each stage occurs in the mitochondria, but only the final stage produces ATP. Each stage produces ATP, but only the third stage occurs in the mitochondria. Each stage produces ATP, but only the first stage occurs in the cytoplasm. Each stage occurs in the cytoplasm, but only the final stage produces ATP.
Answer:Each stage produces ATP, but only the first stage occurs in the cytoplasm.
Explanation:Cellular respiration is the process by which the glucose or any respiratory substrate is burned down inside a cell producing ATP or energy. This process of cellular respiration is seen in each and every living cell. The glucose is burned in the cytoplasm of the cell producing the pyruvate. This pyruvate is decarboxylated into Acetyl CoA and transferred inside the mitochondria. So the glycolysis or the 1st step of cellular respiration occurs in cytoplasm and rest inside the mitochondria.
ATP is produced from each astep of cellular respiration. So the correct option is option C.
Answer:
the answer is c Each stage produces ATP, but only the first stage occurs in the cytoplasm.
Explanation:hope this helps please mark as brainliest
What makes a nerve cell and skin cell have different functions in the body?
Answer:skin cells help protect nerve cells send massages to the brain
Explanation:
Which statement accurately describes how magnetic stripes in ocean rock provide evidence of seafloor spreading?
The pattern of magnetic stripes shows that Earth's magnetic north has always been the same.
The presence of iron indicates that new material cannot be formed at mid-ocean ridges
The pattern of magnetic stripes shows that the seafloor is expanding at mid-ocean ridges
Answer:C.
Explanation:
Don’t know
Magnetic stripes in the ocean rocks provide evidence of seafloor spreading by the pattern of magnetic stripes shows that the seafloor is expanding at mid-ocean ridges. Thus, the correct option is C.
What are Ocean rocks?The oceanic crust or rock is primarily composed of rocks which are rich in iron and magnesium minerals. The rocks of the ocean floor contains iron. As the molten material cooled and harden, the iron bits inside these rocks lined up in the direction of Earth's magnetic poles, creating a pattern of magnetized stripes.
When the Earth's magnetic field reverses, a new stripe, with the new polarity forms. Such magnetic patterns lead to the recognition of occurrence of the sea-floor spreading, and thus remain as one of the strongest evidence for the theory of plate tectonics.
Therefore, the correct option is C.
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7. Among a migrating species of fish, one individual migrates further than any other in its population. As a result, the fish develops stronger swimming muscles than any other individual in its population, allowing it to catch more prey. Having additional food also allows the fish to lay more eggs. Will the fish's offspring be favored by natural selection? Why or why not?
Answer:
no
Explanation:
because evolution happens over a very long peroid of time. the muscle of the fish will not be passed to an offspring (think a body builder human does not give birth to a body builder baby)
The image is showing two possible ways non-homologous chromosomes may line up during metaphase 1 of meiosis 1. Which of Mendel's laws is this image depicting?
Answer:
The correct answer is Mendel's Law of Independent Assortment.
Final answer:
The image depicting non-homologous chromosomes lining up during metaphase I of meiosis I demonstrates Mendel's Law of Independent Assortment. This law explains that alleles of different genes are distributed to gametes independently.
Explanation:
The image depicts non-homologous chromosomes lining up during metaphase I of meiosis I, demonstrating Mendel's Second Law, the Law of Independent Assortment. According to this law, alleles for different traits are distributed to gametes independently of one another.
This is illustrated during metaphase I when chromosomes align at the metaphase plate in random orientations; this means that the orientation of one pair of homologous chromosomes does not affect the orientation of another pair. Consequently, the resulting gametes can possess any combination of the paternal and maternal alleles. It is important to note that this law holds only for non-homologous chromosomes, as genes located on the same chromosome may demonstrate linkage and do not assort independently.
Throught the reflection, make sure you have a copy of the Student Guide and your data table.
In your experiement, you tested this hypothesis:
Hypothesis: If a mouse inherits a particular form of one trait, then the inheritance of the other trait will not be affected because alleles assort independently.
white mouseA white mouse with red eyes and a black mouse with black eyes.
The hypothesis would not have been supported by the data if
traits independently assorted in approximately a 9:3:3:1 ratio.
the traits for white fur and red eyes were always inherited together.
all the F1 offspring had the same phenotype.
If the traits for white fur and red eyes were always inherited together then the hypothesis would not have been supported by the data.
Explanation:
The white fur and red eyed mouse had genotype AA RR or AaRr
The black fur mouse and black eye mouse had genotype aarr
The F1 offspring will have all offspring with same phenotype as shown in the Punett square.
AR AR
ar AaRr AaRr
ar AaRr AaRr
all the siblings are of same phenotype
Punnet square to show that genes assort independently.
Ar AR
ar Aarr AaRr 2 white fur and black eye: 2 white fur red eye
ar Aarr AaRr
The phenotype pattern of this punnet square shows that white fur and red eyes are not always inherited.
The law of independent assortment is shown from the cross that is by selfing.
AR Ar aR ar
AR AARR AARr AaAR AaRr
Ar AARr AArr AaRr Aarr
aR AaRR aArR aaRR aaRr
ar AaRr Aarr aaRr aarr
phenotype ratio of 9:3:3:1
9 WHITE FUR RED EYE
3 WHITE FUR BLACK EYE
3 BLACK FUR RED EYE.
1 BLACK FUR BLACK EYE
By cross checking, the options given it is concluded that the traits for white fur and red eyes are not always inherited together, the two traits are governed by different genes and are independently exhibited in the individual as stated in law of independent Assortment.
If the traits for white fur and red eyes were always inherited together, it would contradict the hypothesis of independent assortment of alleles. Therefore, option (B) is correct.
The notion of independent assortment states that gamete production segregates alleles for distinct qualities. A continuous pattern of allele inheritance shows genetic linkage, which contradicts independent assortment.
In genetic linkage, genes close together on a chromosome are inherited together more often. If white fur and red eyes were routinely inherited together, they would be physically near on the same chromosome and more likely to be transferred together during meiosis. This contradicts independent assortment, which believes that homologous chromosomes randomly position during meiosis to segregate alleles separately.
In essence, if qualities that are not physically connected in the same chromosome are inherited together, it demonstrates departures from independent assortment and supports genetic linkage or interaction between those genes. Therefore, option (B) is correct.
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Oops! You were cleaning out the aquarium in the biology lab and you accidentally placed the salt water fish in the freshwater tank. What will happen to the cells of these fish
Saltwater fish in freshwater and freshwater fish in saltwater both suffer from osmosis effects that can be fatal. Saltwater fish cells could swell and burst in freshwater, while freshwater fish cells could dehydrate and collapse in saltwater, due to differences in osmotic pressures.
Fish cells have semi-permeable membranes, allowing certain substances to pass through while blocking others. When a saltwater fish is placed into a freshwater environment, a process known as osmosis occurs, where freshwater flows into the cells of the fish, making the cells swell and potentially causing the fish to die.
Conversely, a freshwater fish placed in the ocean, which has a hypertonic environment in comparison to the freshwater fish's body fluids, will experience the opposite effect. Water from the fish's cells will flow out into the surrounding salty water, leading to cell dehydration and possible death. Both types of fish spend energy to maintain osmotic homeostasis; freshwater fish actively absorb salt through their gills and secrete dilute urine, while saltwater fish secrete salt through their gills and produce highly concentrated urine to manage the osmotic pressures.
How does apoptosis aid in normal embryo development?
Explanation:
Apoptosis – programmed cell death – is very important in embryo development. DNA replication is not 100% error proof. Since embryo development calls for a high rate of DNA duplication due to the numerous cell divisions occurring in the embryo as it develops, some cells may bear some DNA mutations due to error in DNA duplication by DNA polymerase. The cells have mechanisms to detect such errors and if they are irreparable, apoptosis is initiated, destroying these damaged cells. This protects the integrity of the embryo ensuring cells with damaged DNA do not divide and result in abnormalities.
Apoptosis aids in normal embryo development by eliminating excess cells, sculpting organs and tissues, and ensuring proper cell connections.
Explanation:Apoptosis, also known as programmed cell death, plays a vital role in normal embryo development. During embryogenesis, apoptosis helps shape and refine organs and tissues by eliminating excess or unwanted cells. For example, the formation of fingers and toes involves apoptosis between the digits. Additionally, apoptosis serves as a quality control mechanism, ensuring that proper cell connections and structures are established.
An example of apoptosis aiding in normal embryo development is the development of the nervous system. Initially, neural progenitor cells undergo a process called proliferation, where they divide rapidly. As the nervous system develops further, specific cells are designated to become neurons, while others undergo apoptosis. This selective elimination of certain cells is crucial for the refinement and proper functioning of the nervous system.
In summary, apoptosis aids in normal embryo development by eliminating excess cells, sculpting organs and tissues, and ensuring proper cell connections. It is a tightly regulated process that contributes to the precise and controlled development of embryos.
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10. According to the passage, the bionic pancreas makes corrective actions that return blood
sugar levels back to normal. This artificial device helps
a. produce more sugar
b. break down blood cells
c. maintain homeostasis
d. cure their diabetes
Final answer:
The bionic pancreas assists in maintaining homeostasis by regulating blood sugar levels to normal through the administration of insulin, but it does not cure diabetes.
Explanation:
According to the passage, the bionic pancreas makes corrective actions that return blood sugar levels back to normal. This artificial device helps maintain homeostasis by adjusting the amount of insulin in response to the blood glucose levels, similar to how natural pancreatic function maintains blood sugar levels through the secretion of insulin and glucagon. This bionic device works to regulate blood sugar levels, but it does not cure diabetes, produce more sugar, or break down blood cells.
what happens to the mRNA before it comes to the ribosome?
The mRNA molecules are transported through the nuclear envelope into the cytoplasm, where they are translated by the rRNA of ribosomes (see translation). ... Messenger RNA (mRNA) then travels to the ribosomes in the cell cytoplasm, where protein synthesis occurs
Answer:
The mRNA is end product of transcription that takes place in the nucleus and it is followed by translation or synthesis of proteins. So, the first important step is to transport the mRNA to the cytoplasm via nuclear pore complex.
Explanation:
The process of transcription is second step of the central dogma of molecular biology. This process is characterized by the creation of mRNA strand from the template pre-mRNA strand. This process involves three defined steps of initiation, elongation and termination. RNA polymerase is the associated enzyme that plays a critical role in the process.
The occurrence of this process in the nucleus illustrates the carrying away of the product formed that is the mRNA to the cytoplasm. The transport process takes place via nuclear pore complex. The ribosome in the cytoplasm reads the mRNA and forms the protein.
MULTIPLE CHOICE QUESTION
What is the largest estimate for OIL
reserves?
110 years
54 years
70 years
brainlist. answer rn!
Answer:
first one- A)FAULT
second one-B)VOLCANIC ISLANDS
Are there antivirals and vaccines for avian influenza? What needs to be done in order to develop some?
1. No antivirals or vaccines exist currently.
2. Vaccines are made by weakening the virus, inactivating the virus, using a part of the virus, or using a part of the bacteria. This vaccine still has to be then approved by the proper authorities (ex. CDC, WHO), tested on trial groups, then it has to be mass produced. The distribution of it may even be the hardest part. Overall, this is a long and pain staking process.
Which fungus would be the first to grow back after a volcanic eruption destroyed
all the life on a tundra plain?
(A) parasitic yeast
(B) photosynthesizing mold
(C) pioneer lichen
(D) saprophytic mushroom
Answer:
Pioneer Lichen
Explanation:
I had this answer on my test and got it correct. It is C
I need help ASAP plz and thank u
Answer:
its going to increase the rate of breathing.
Explanation:
How are protists different from bacteria and archaea
Explanation:
they are 10x larger as if you see a picture of a protists they're larger
they are eukaryotes so the organism consisting of a cell or cells in which the genetic material is DNA in the form of chromosomes contained within a distinct nucleus.
they have both single and multi celled organisms
Your 2nd section should be about reproduction in an animal
of your choice. What is this animal’s gestational period?
How and where does this animal give birth? How does it
feed its young
make it grade 6 friendly pls
Answer:
1) Reproduction is a process in which offspring is produced due to the mating of male organism with female organism. Offspring is the baby of that organism.
2) Gestational period is the period that is required for the development of fetus until its birth. Fetus is unborn baby made of zygote. It occurs in mammals.
3) The baby organisms or offspring come out from the female organism's body.
4) The mammals feed their milk to their babies which is highly nutritious.
As the light intensity and carbon dioxide concentration increases the rate of photsythesis ?
Answer:
it depends
Explanation:
Different plants may have different speeds in which they produce oxygen or absorb carbon dioxide therefore photosynthesis may have different rates of speed.
Which best explains why viruses do not have special structures or enzymes that allow them to make the
Viruses can use energy in living cells that they infect.
Viruses can replicate inside a host that they infect
Viruses can cause contagious illnesses in host cells.
Viruses integrate their RNA or DNA into infected cells.
Answer:
Viruses can replicate inside a host cell that they infect. Viruses are the organisms which have the characteristics of both living and non living things. Virus is non-living outside the cell and present in crystalline form but when a virus is put into a living cell, it starts growing there. When the cell is infected, the virus enters into the another cell and starts infection there.
It's right on edg
Elaborate about Parkinsons and alzheimers disease.
Answer and Explanation:
Parkinson's and Alzheimer's diseases are nuero-degenerative disorders that affect human beings. These are both a form of Dementia, a syndrome that affects the brain, causing symptoms including:
reduced capacity for multitaskingmemory failureissues understanding languageloss in understanding spatial orientationAlzheimer's disease is characterized by a loss in these functions, and is eventually fatal, stemming from brain failure. It is genetic and may be influenced by environmental factors like smoking, diet, traumatic brain injury and diabetes among others.
Parkinson's disease is characterized by rigid muscles, tremors, and slowed motion. This may be cased by several non specific conditions such as poisoning, brain damage, head trauma and other complex neurodegenerative diseases.
Two different plants are crossed. One has the genotype tt and the other Tt. What is the genotype ratio for this cross? What is the phenotype ratio?
Answer: Genotypic: 2:2
Phenotypic: 2:2
Explanation:
Crossing a plant with genotype tt and another with Tt results in offspring with genotypes 50% Tt and 50% tt, and a phenotypic ratio of 1 tall:1 dwarf. The presence of the T allele results in a tall plant because T is dominant, while homozygous recessive tt results in a dwarf plant.
Explanation:When crossing two different plants, one with genotype tt and the other with genotype Tt, you can use a Punnett square to determine the potential genotypes and phenotypes of the offspring. Since T is dominant, we'll represent the tall phenotype with T and the dwarf phenotype with t.
The Punnett square results in the following genotypes: 50% Tt (heterozygous) and 50% tt (homozygous recessive). The phenotypic ratio is 1 tall:1 dwarf, because the presence of even one T allele (Tt) will result in a tall plant, while only the tt genotype will result in a dwarf plant.
If you look at other example genotypic crosses, such as Aa x Aa, you'll find a genotypic ratio of 1 AA:2 Aa:1 aa, and a phenotypic ratio of 3 dominant:1 recessive. In the cross AABb x Aabb, the genotypic ratio is more complex due to the two different traits being examined, but you can expect a certain proportion of offspring to express the dominant phenotypes. Whenever analyzing crosses, it's important to consider whether the traits are being governed by dominant or recessive alleles.
Respiratory structures in order of airflow from outside to inside the body
Final answer:
Air journey from the external environment to the alveolar sacs involves several structures, starting with the nasal cavity and moving through the pharynx, larynx, trachea, primary bronchi, secondary and tertiary bronchi, bronchioles, and onto the alveolar ducts and sacs where gas exchange occurs.
Explanation:
The journey of air from the outside to the inside of the body involves passing through several structures that are part of the respiratory system. Understanding this pathway can provide insights into how our bodies process air for the essential exchange of oxygen and carbon dioxide, which is vital for cellular respiration and energy production.
Nasal cavity: The first point of entry where air is warmed, humidified, and filtered.Pharynx: This serves as a path for air from the nasal cavity to the larynx.Larynx: Often referred to as the voice box, it directs air into the trachea and prevents food from entering the airway.Trachea: This tube, also known as the windpipe, further conducts air to the bronchi.Primary bronchi: The trachea splits into the left and right bronchi, each leading to a lung.Secondary and tertiary bronchi: These are further divisions within the lungs, branching into smaller passages.Bronchioles: Smaller tubes that distribute air to different regions of the lungs.Terminal and respiratory bronchioles: Final branches that lead air into the gas exchange sites.Alveolar ducts then alveolar sacs: Structures where gas exchange with capillaries occurs, allowing oxygen to enter the blood and carbon dioxide to be expelled.Each of these structures plays a critical role in ensuring air is properly processed for gas exchange, demonstrating the complexity and efficiency of the human respiratory system.
Select all the correct answers.
What are three types of media that could be included in a presentation?
examples
graphs
images
audio
O
facts
Reset
Next
Answer:
images, graphs, and audio
Explanation:
Answer:
The answer is
A. Audio
D. Graphs
E. Images
Explanation:
What is key to preventing extinction of any one species?
This describes how many protons reside in the nucleus and identifies the element.
A. Symbol
B. Atomic Mass
C. Charge
D. Atomic Number
Answer: D. Atomic Number
Explanation:
Atomic number of an element is the number of protons in the nucleus of an atom the element. An atom has three fundamental particles: protons, electrons and neutrons. Protons and neutrons are found in the nucleus of an atom while electrons are found outside the nucleus. The atomic number of an element determines the properties of the element. No two atoms of different elements have the same atomic number, but two or more atoms of the same element can have the same atomic number but different atomic masses. When atoms of the same element have the same atomic number but different atomic masses, they are said to be isotopes.
1. When homozygous white cattle are crossed with homozygous red cattle, each of the offspring has a
mis of white and red hairs. This blend of colors is called roan. What can you infer about the pattern
of inheritance involved in the formation of a roan coat in cattle? Explain your answer.
Answer:
When homozygous white cattle are crossed with homozygous red cattle, each of the offspring has a mix of white and red hairs. This blend of colors is called roan. What can you infer about the pattern of inheritance involved in the formation of a roan coat in cattle?
WW x RR= WR, WR, WR and WR
WW= Homozygous white cattle
RR= Homozygous red cattle
WR= Roan (Mix of red and white cattle)
WR x WR= WW, WR, WR and RR
When the roan cattle (WR) is crossed with one another, the offspring produced gives a mix of white and red cattle (75%) and homozygous red cattle (25%).
Explanation:
If when homo-zygous white cattle are crossed with homo-zygous red cattle, offspring have a mix of white and red hairs, then it is a case of codominance.
Diploid organisms (such as cattle) inherit two gene forms or 'alleles' for a given gene locus, one from each parent.An individual is homo-zygous when inherits the same alleles for a given gene locus, whereas an individual is heterozygous when inherits different alleles for a given gene locus.In cases of codominance, both alleles are expressed in heterozygous individuals, thereby forming a phenotype that is different from parental phenotypes in a double homo-zygous cross.In conclusion, if when homo-zygous white cattle are crossed with homo-zygous red cattle, offspring have a mix of white and red hairs, then it is a case of codominance.
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Black fur is dominant to brown hair in guinea pigs. Incomplete dominance is exhibited in guinea pigs with gray and white hair. What could you do to determine the genotype of guinea pig with black fur?
Mate the black guinea pig with a brown guinea pig.
Mate the black guinea pig with another black guinea pig.
Mate the black guinea pig with a white guinea pig.
Mate the black guinea pig with a gray guinea pig.
Answer:
Mate the black guinea pig with a brown guinea pig.
Explanation:
Mating must be done with a brown guinea pig, since this type of mating will enable to determine the presence of heterocigotes "black hair" by calculating the frequency in the progeny
Answer:
B
Explanation:
What are the climates of the tropical rainforest ideal or perfect for?
good for plants
Explanation:
Tropical rainforest climates are ideal for year-round plant growth, biodiversity, and the evolution of specialized species.
Explanation:Tropical rainforests have climates that are ideal for a variety of things.
The stable temperature profile and high amount of sunlight provide favorable conditions for year-round plant growth. This results in lush vegetation and high biodiversity, with a wide variety of plant and animal life.
The tropical rainforest climate also offers a stable environment, which can promote the evolution of specialized species and provide potential sources for new drugs and medicines.Additionally, the consistent warmth and abundant rainfall in tropical rainforests create a continuous growing season, allowing plants to flourish without the limitations imposed by seasonal changes.
Helppp I don’t know the answers and need to know as soon as possible
Answer:
A) central nervous system
B) Peripheral nervous system