Answer:
A plausible hypothesis is that deleterious germline mutations in sperm cells are removed by natural selection since sperms have to compete to fertilize the egg
Explanation:
Sperm cells need to travel through the cervix in order to reach the uterus and fertilize the egg. During this process (which is called 'fertilization'), approximately 300 million sperm cells have to compete in a race to reach an egg. During fertilization, the majority of sperm cells die off quickly because male germinal cells carry mutations that lead to abnormalities (e.g., many sperms have double heads, others no tail, etc). The sperm cells are considered to be physiologically weak because their normal functions can be easily disrupted by mutations and, simultaneously, they are under strong selective pressure to be selected during the sperm race. In consequence, deleterious germline male mutations are expected to be eliminated by natural selection, thereby sperms are selected before fertilization so only the strongest ones can compete in the race to fuse with the egg cell and thus develop one zygote.
Describe the sliding filament model of muscle contraction. What role do acetylcholine and acetylcholinesterase play in muscle contractions
Answer:
It Is me the Explanation Wizard (づ｡◕‿‿◕｡)づ
Explanation:
Hey (☞ﾟ∀ﾟ)☞ It's the Explanation Wizard here for your troubles I don't wanna waste time so here is my answer+explanation that I have personally wrote for you.The first question you asked here's the a+e The sliding filament model describes the process used by muscles to contract. It is a cycle of repetitive events that causes actin and myosin myofilaments to slide over each other, contracting the sarcomere and generating tension in the muscle. second a+e for second question When the nervous system signal reaches the neuromuscular junction a chemical message is released by the motor neuron. The chemical message, a neurotransmitter called acetylcholine, binds to receptors on the outside of the muscle fiber. That starts a chemical reaction within the muscle. Explanation Wizard out
Which is an example of temporal isolation?
flowers that bloom in different months
birds that have different mating calls
fruit flies that mate in different locations
squirrels that have different fur colors
Flowers that bloom in different months is an example of temporal isolaton.
What is temporal isolation?Temporal isolation is a type of reproductive isolation that occurs when two or more species reproduce at different times, thereby preventing mating between them. This can happen in a variety of ways, such as when one species is active during the day and the other at night, or when they breed during different seasons.
Temporal isolation can lead to the evolution of new species because it prevents interbreeding between populations that would otherwise exchange genetic material. Over time, these isolated populations can accumulate genetic differences that make it increasingly difficult for them to interbreed, leading to the formation of distinct species that are reproductively isolated from one another.
Learn more about temporal isolation, here:
https://brainly.com/question/7741418
#SPJ5
atrial fibrillation, a dangerous form of irregular heartbeat is associated with the intake of _____.
Answer:
Palmitic acid
Explanation:
Intake of palmitic acid is associated with atrial fibrillation.
Palmitic acid - is a saturated long-chain fatty acid and a straight chain saturated fatty acid with a 16-carbon backbone. Palmitic acid is found naturally in palm oil and palm kernel oil, as well as in butter, cheese, milk and meat. It is a conjugate acid of a hexadecanoate.
Hexadecanoate - is a long-chain fatty acid anion that is the conjugate base of hexadecanoic acid (palmitic acid).
The spinal cord extends from the foramen magnum of the skull to the first or second lumbar vertebra, where it terminates in the __________.
Answer:
conus medullaris
Explanation:
Red-feathered and blue-feathered birds occupy the same environment. The birds with the red feathers are better able to survive and avoid predators. This means that the population of red-feathered birds will increase in future generations. This illustrates the process of
Answer:
Natural selection.
Explanation:
Natural selection is the process in which the well suited organism is selected by the nature which is able to survive the environmental conditions while on the other hand, not well suited organisms are extinct from the environment. Due to this natural selection, the population of red-feathered birds will increase in the future as compared to blue-feathered birds which will be decreases due to susceptible to predators and environment.
What is a mycelium?
A. long, skinny, branching filaments with cross walls to separate
the nuclei
B. a mass of hyphae under the fruiting body that do the work of
decomposing
C. the material above the soil that contains spores for reproducing
A friend who is not taking your Biology course fills a cup with ice and then a drink. The friend asks you why the ice in the cup is floating, and you are able to say that Group of answer choices water vapor is less dense than liquid water. ice is denser than liquid water. convection currents caused by temperature differences push upwards on the ice. the molecules are closer together in ice than in liquid water. the molecules are farther apart in ice than in liquid water.
Answer:
the molecules are farther apart in ice than in liquid water.
Explanation:
The correct answer would be that the molecules of water are farther apart in ice than in liquid water.
Water molecules in ice form are usually less dense than water molecules in liquid form. The water molecules in ice usually arrange themselves in a lattice form, unlike the random form in liquid water. This arrangement makes water molecules in ice to be more evenly spread out than in their liquid counterpart. Thus, ice is usually less dense than liquid water and will obey the principle of flotation by floating on water.
The ice in the cup is floating is due to: the molecules of water are farther apart in ice than in liquid water.
The density of a substance is the mass of the substance per unit of its volume. The formula to calculate the density is :
[tex]D = \frac{m}{v}[/tex], where D = density, m = mass of the substance, and v = volume
The density is the factor that determines if a substance will float or sink. The less-dense substance floats whereas, the more-dense object sinks.When water freezes to form ice then water molecules show expansion to create an open cage-like structure.This cage-like structure decreases the density of ice than the water so mass ice will have more volume as compared to liquid water.Thus, the ice floats on water - the molecules of water are farther apart in ice than in liquid water.
Learn more about the density:
https://brainly.com/question/17569847
What is produced/made when our food is burned?
___+___+___
Answer:
it should be ( carbon dioxide, oxygen, and energy
Explanation:
Explanation:
Oxygen /carbon dioxide and energy
This is the process happens continuously inside our body .This is called respirationwhy do wild plants need to reproduce sexually as well as asexually ?
Please answer correctly
Answer:
Wild plants would need to reproduce sexually so that there can be variation throughout the species to reduce the number of plants being at risks to certain diseases if the environment is changing. However, the wild plants need to produce asexually if the environment is stable.
Wild plants need to reproduce sexually as well as asexually in order to create variation within a species and lower the number of plants that are susceptible to specific illnesses in a changing environment.
What are wild plants?Wild plants would need to reproduce sexually. However, if the environment is stable, wild plants must reproduce asexually. Since male and female gametes are not mixed, asexual reproduction produces plants that are genetically similar to the parent plant and increases survival.
A seedling formed from a seed matures more slowly and is less robust than a cutting or bud is taken from an older plant.
Therefore, in order to diversify within a species and reduce the number of plants susceptible to specific diseases in a changing environment, wild plants must reproduce both sexually and asexually.
To learn more about wild plants, refer to the link:
https://brainly.com/question/13672697
#SPJ2
2. Many microscopic organisms are clear, making them almost impossible to see under a microscope.
What can be done to a sample to make it easier to see?
Use iodine.
Iodine solution makes the sample you want to study of microscopic organism more visible.
The image shows a rain forest ecosystem. The energy from plants, or producers, acts as the starting point of energy in the ecosystem. This energy is transferred to other organisms in the food web. In which two ways is the total amount of energy conserved in the ecosystem?
Some energy is transferred to the organisms, and the remaining energy is released into the ecosystem as thermal energy.
Bacteria eat the dead bodies of organisms to release the organisms’ stored energy into the atmosphere.
Some energy is transferred to the smaller organisms, and the rest is stored in the bodies of larger animals.
Some energy is transferred to the organisms, and the rest is released by plants in the form of carbon dioxide.
Bacteria eat the dead bodies of organisms, obtain all the energy, and store it in their bodies.
Answer:
some energy is transferred to the smaller organisms and the rest is stored in the bodies of larger animals
A cloned mammal is made by removing the DNA from the unfertilized egg of an egg donor, replacing it with DNA from a cell of a mature animal, and then implanting that cell into the uterus of a surrogate mother. The cell then divides and behaves as if it were a regular embryo. Answer the following question(s) regarding a clone.Of whom is the baby a clone?
Answer:
The mature animal
Explanation:
The baby would be a clone of the mature animal whose DNA was placed in the unfertilized egg before being implanted into the uterus of a surrogate mother.
The DNA of the egg donor has been removed and replaced with the DNA of the mature animal. The surrogate mother is just a mere carrier and has no biological relationship with the clone. The only organism with biological relationship with the clone would be the one that donates its DNA, which in this case is the mature animal.
A darkly staining region that may appear within the nucleus on an electron micrograph is called a(n) ______. This is the location of rRNA production.
Answer:
the answer is nucleolus.
Explanation:
the production of ribosomes makes it dark or stained
A scientist was studying a population of elephants. The first year, he counted a population of 80. Over the next eight years, the population's numbers were 94, 100, 103, 110, 125, 120, 125, 120. What appears to be the carrying capacity for this population? 120 124 125 126
Answer:
125
Explanation:
The correct option would be 125.
The carrying capacity of a particular environment generally refers to the maximum number of individuals of a particular species that the environment can support at a particular time based on the resources it has. Hence, the maximum population of a species will normally oscillate around the carrying capacity of the environment where it is found.
In the case of the elephants in the illustration, the maximum population recorded was 125. The population decreased from this value at some point only to increased back to it later.
Hence, the carrying capacity for the elephant is 125.
Answer:
125
Explanation:
Compare and contrast the cell structures / organelles found in plant and animal cells.
list 3 organelle/structures plant and animal cells have that are the same
list 2 organelles/structures plant and animal cells have that are different
Answer:
Same: Mitochondria,Cell membrane,Vacuole
Different: Cell wall,Chloroplast
Explanation:
I hope this helps :)
The weirdest laws in the world gets brainliest. Look up the weirdest laws in the world and either post it in the comments or as an answer.
I don't want anything inappropriate or I will report you!
Answer:
Parliaments famous Salmon Act of 1986 states that it's illegal to hold salmon under suspicious circumstances.
Which method of waste treatment is LEAST harmful to the environment?
Answer:
c
Explanation:
because burning burying and landfill are all harmful
The fibrous protein that gives skin its flexibility and helps skin regain its shape after being expanded is:
Answer:
Elastin
Explanation:
The elastin is defined as an extracellular matrix protein which lends to the elasticity and also resilience to the tissues such as the lungs, skin, arteries, tendons, and the ligaments.
Elastin synthesized from precursor molecule named tropoelastin.
Elastin is the fibrous protein which gives the skin its flexibility and also helps the skin regain its shape.
After a severe burn, new skin may grow outward from the hair follicles. Why would new growth originate at the hair follicles
Answer:
xsdcfvgbhnj
Explanation:
The total number of molecules of ATP produced during glycolysis is ______, which results in a net production of _____ ATP.
Answer:
The answer is "4 and 2 ".
Explanation:
The overall glycolysis ATP number is 4 of one hydroxyl group. In the first part of the glycolysis 2 ATP molecules are used, so that 2 ATP molecules are net gained. 2. In addition, 2 NADH atoms in the glycol are also created. This is why the total ATP molecules produced during metabolism are 4, resulting in a net output of 2 ATP.
Blood banks dispose of blood that has low levels of bisphosphoglycerate. What would be the probable reason for doing so
Answer:
Erythrocytes low in BPG does not unload O2 very well.
1. How does scientific inquiry differ
from simply asking questions?
Answer:
inquiry means more than asking questions. Inquiry is a process of investigation, with thoughtful questions leading to a search for answers. Asking questions is a natural activity for all curious minds, but even figuring out what to ask takes practice.
Why are groups of small cells better than one large cell at moving material in
and out?
A. They have a smaller volume.
B. They have more cell structures,
C. They have a greater surface-to-volume ratio.
O
D. They have a lower surface-to-volume ratio.
Answer:
C. They have a greater surface-to-volume ratio.
Explanation:
Because these smaller cells can access and pass through the membranes of the other cell membranes and permeable coverings easily and voluntarily unlike larger cells. It is also efficient for these smaller cells to penetrate and travel, delivering and transporting goods and materials such as nutrients, oxygen and waste throughout the body without consuming enough energy and conserving lesser space.
For simple reasons, they are faster, more efficient and consumes little space, and most especially depletes lesser energy. So, many small cells have more surface area than one large cell.
what is cell membrane ?
Explanation:
the thin outside layer that surrounds the cytoplasm of a cell and controls the movement of materials into and out of the cell. cell membrane.hope it helps.stay safe healthy and happy....Which wound usually involves ears, fingers, and hands, and results in tearing or pulling off of a flap of skin
Answer:
Avulsion.
Explanation:
Human bite wounds are blunt wounds, sometimes with partial or total avulsion (ear, lips, nose, hands) and with intense contamination. An avulsion is a complete tear of the skin and subcutaneous tissue. It does not allow the approximation of edges. It presents moderate to abundant hemorrhage and is accompanied by the exposure of underlying tissues (bone, tendon). The tear can be complete or partial; in the latter case, a connection or bridge is preserved between the torn tissue and the rest of the body.
Why the water is an inorganic, transparent, tasteless, odorless, and nearly colorless chemical substance?
Answer:
Water is inorganic, transparent, delicate, odourless, and almost colourless.
Explanation:
How colourless is the water?
In fact, it isn't. It's weakly blue, and when many of them are gathered together, it gets obvious. However, it's obviously not very colourful. This is a pretty common occurrence. Very few simple materials are coloured intensely. Pure salt and sugar are also colourless and clear. They look white in mass because the little crystals disperse light, but the snow does the same. A fluid forms a uniform bulk.
Substances are seldom pure in nature, of course. Not so much looks colourless, therefore. It takes just a few colourful uncleanness to colour the whole thing. Look for Himalayan salt or sugar or orange juice unprocessed.
Why is water odourless?
We don't have to taste it because of this. From that feeling, we obtain a decent estimate of the water content of food. The oils, which feel much different, usually are other liquids. Moreover, the exact amount of water in a certain food item is not all so important, if we need moisture we will certainly drink things that are primarily water.
The sensation of taste without water releases the ability to discern other things.
Why does water smell?
We don't have to smell it, too. There is no genuine advantage of being able to identify the humidity of the air instantaneously. It's better to use the sense of smell to detect poisons, nutrients, relatives or strangers, etc. IN various ways, we can tell how the weather is.
Which statement about inheritance is true?
Girls get most of their traits from their moms; boys get most of their traits from their dads.
Male offspring will always have an X-linked genetic disease if the mom is a carrier.
Fathers always determine the gender of the offspring in humans.
Males never have Y chromosomes.
Answer:
The correct answer is the third statement.
Explanation:
In humans, the males possess one X and one Y chromosome, while the females possess two X chromosomes. Thus, the female always donates X chromosome to the gamete. In any case, the female always generates a similar kind of gamete. While the male either pass X or the Y chromosome to the progeny.
When the gamete with the X chromosome combines with the female gamete than the offspring would possess XX chromosomes and will be a female. On the other hand, when the gamete comprising the Y chromosome combines with the female gamete than the offspring would possess the XY chromosome and will be a male. Thus, it is the father who determines the gender of the offspring.
This is wrong. Parents gender does not affect traits passed on.
Males never have Y chromosomes.This is wrong, Males have to have a Y chromosome. (XY)
Male offspring will always have an X-linked genetic disease if the mom is a carrier.This is wrong. The male offspring have a 50/50 chance if the mother is a carrier, if she has the deseace than all the sons will have the decease.
Correct answerFathers always determine the gender of the offspring in humans.This is because the mom is XX and the dad is XY. The mom gives the X in the gene, and the dad gives the X for daughters (X,X) and gives the sons a Y (X,Y) Males are always XY.
If the mom is a carrier, h, then it will get passed down 50% of the time, and when it gets passed down to the males, they wiill have the deseace. If the mom passes the deacease down to the daughters, 50% will be a carrier too if the dad does not have the deseace. If the dad has the deacease, than 50% of the daughters will have the deacease, and the other 50% will be carrier, and still, 50% of the sons will have the deacease, while the other 50% will be completely clean. So in total 25% of the offspring will be a carrier, 50% will have the deacease, and the other 25% will not have the deacease or be a carrier.
A sequence is defined recursively by the formula f(n + 1) = –2f(n). The first term of the sequence is –1.5. What is the next term in the sequence?
Answer:
3
Explanation:
n = - 1.5
f(n+1) = -2f(n)
f(n+1) = -2 * -1.5
f(1+1) = 3
f(2) = 3
In intramembranous ossification, newly formed bone that is immature and not well organized is called ______.
Answer:
Woven bone.
Explanation:
In intramembranous ossification, newly formed bone that is immature and not well organized is called woven bone. Osteoblasts are the type of cells that is responsible for the formation of new bone. These osteoblasts also come from the bone marrow and are related to structural cells. They have only one nucleus. The process of bone formation is called osteogenesis whereas there are three stages of bone development i.e. proliferation, maturation of matrix, and mineralization.
What makes aquatic biomes different is the salt
content of the water. What is the salt content in
most marine biomes?
A. 1%
B. 10%
C. 5%
D. 3%
water covers about 75%of the earth surface. salt content in the Marine biomes is 35ppt. the ocean with the highest level of salt is the Atlantic ocean which has 37ppt of salt.
Answer:
Explanation:3