Natural Selection and Genetic Drift
evolution refers to the change in the characteristics of a species over several generations and relies on the process of natural selection.
there are four types of mechanism of evolution:
natural selectiongenetic driftgene flowmutationthe mechanism of evolution could involved in the evolution of wolves and dogs are:
natural selection and genetic drift
natural selection favored wolves that were bold and friendly. bold and aggressive wolves would be killed and hence unable to breed. this allowed bold and friendly dogs to breed, which was key to eventual evolution into dogs.
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using a named examples explain the differences between a specific body defence mechanism and a non- specific body defence mechanism
Answer:
Specific body defence mechanism are resistance that are directed against only one specific invader while,
Non specific defence mechanism protects against any of an enormous range of possible dangers.
Explanation:
NON SPECIFIC DEFENCE MECHANISM are the first lines of general defence, they prevent entry and minimise further passage of microbes and other foreign material into the body. There are five main non specific defence mechanisms, these include:
--> defence at body surface
--> phagocytosis
--> natural antimicrobial substances
--> inflammatory response
--> immunological surveillance
Using PHAGOCYTOSIS as a named example of non specific defence mechanism. This involves phagocytes such as the macrophages and neutrophils which are able to trap any invading microbes either by engulfing them or by extending long pseudopodia towards them which grasp them and reel them in. These cells are NON SELECTIVE in their targets.
SPECIFIC BODY DEFENCE MECHANISM directs its actions against a specific invader. In addition immunological memory develops which confers long term immunity to specific infections. The immunity could be cell mediated or antibody mediated immunity.
Using CELL MEDIATED IMMUNITY as an example, Cytotoxic T-cells directly inactivate any cells carrying antigens. This means they are SELECTIVE in their targets. They attach themselves to the target cell and release powerful toxins, which are very effective because the two cells are so close together. This leads to destruction of abnormal body cells such as infected cells and cancer cells.
How do genes code for traits
Answer:
A gene codes for a particular protein that is involved in the expression of a trait.
Explanation:
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Describe the animal, the crayfish
Answer:
Hey mate......
Explanation:
This is ur answer......
Crayfish is a nocturnal freshwater crustacean that resembles a small lobster and inhabits streams and rivers.Hope it helps!
Brainliest pls...
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2. What is plate tectonics?
a. The joining of the Earth’s plates into one plate
b. Movement of the Earth’s plates on the mantle
c. The ring of volcanoes around the Pacific Ocean
d. The way scientists measure earthquakes
Answer:
Suppose we add up alternate Fibonacci numbers, Fn-1 + Fn+1; that is, what do ... L(1)=1 and L(3)= 4 so their sum is 5 whereas F(2)=1; L(2)=3 and L(4)= 7 so their ... What is the relationship between F(n-2), and F(n+2)? You should be able to find a ... Fib(N); K (an EVEN number!), Lucas(K) and Fib(K) in each expression like ...
Explanation:
What unit of time on Earth is based on the rotation of the Earth?
A.day
B.hour
C.month
D.year
Answer:
year
Explanation: Every year the earth rotates one time so that is right.
use uterus and vagina in the same sentence
Answer:
Fertilized eggs attach to the sides of the uterus, which is in the vagina.
Which best describes a possible negative impact of irrigation of farmland?
Answer: Food can be produced in dry areas. Increased runoff can pollute bodies of water. Food can be produced through drought years. Water can improve the livelihood of farmers.
Answer:
B. Increased runoff can pollute bodies of water.
Explanation:
Tendrá la intensidad de la luz un efecto en la velocidad de la fotosíntesis, cuando los períodos de exposición están limitados a la duración normal de la luz para una planta
Answer:
ver explicacion
Explanation:
La fotosíntesis es el proceso mediante el cual las plantas verdes fabrican su propio alimento en presencia de luz solar, clorofila, dióxido de carbono y agua.
La intensidad de la luz afecta la tasa de fotosíntesis, cuanto mayor es la intensidad de la luz, mayor es la tasa de fotosíntesis y viceversa. Cuando hay una mayor intensidad de luz, hay más luz disponible para impulsar las reacciones de la fotosíntesis.
Summarize the benefits and drawbacks of becoming a veterinarian,
Answer:
Drawbacks: Veterinary school is long and extensive, some surgeries can take hours, sometimes you may get an uncooperative animal, you might have to deal with putting an animal down, which can be hard. You also might be scared for live with graphic images, lol.
Benefits: Vets get paid a lot, they help animals, they help animals live the best life, people are VERY appreciative of the work they do for animals, they are always around animals, so they may see the cutest puppies!
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is this in order ?
if not could you reorder them ? thank you.
! no links pls !
Answer: Eukaryotic Cell, Nucleus, DNA, Chromosome, Gene, and Allele.
Explanation:
Hi. Is this correct?????
Answer:
Yes, that is correct.
Explanation:
where in the fossil record would you expect to see older common ancestors
How would gradualism persent in the fossil record
Answer:
hii
Explanation:
what are you doing
how are you doing
If a DNA strand has the following sequence, what is the sequence of the complementary strand?
ACCTAGTCG
Answer: TGGATCAGC
Explanation:
in which does light travel fastest
Light waves do not need a medium in which to travel but sound waves do. Explain that unlike sound, light waves travel fastest through a vacuum and air, and slower through other materials such as glass or water.
Answer:
light travel faster in Vacuum and Air
PLS HELP IVE BEEN ASKING FOR 2 DAYS OML NOBODY WILL HELP ;( ME GO CRY
Answer:
A.
Explanation:
Bc the rest are not reasonable
Answer:
A. to maintain desirable traits
Explanation:
I'm positive that this is correct
Which of these would be considered low
pressure?
a) 850 mb
b) 1200 mb
Answer:
A
Explanation:
The general rule in meterology is that low pressure is under 1,000 mb
How does the aorta compare in size to the other blood vessels near it?
Answer: Its wider and thicker than most blood vessels
Answer: The aorta is the largest blood vessel in the body. This artery is responsible for transporting oxygen rich blood from your heart to the rest of your body. The aorta begins at the left ventricle of the heart, extending upward into the chest to form an arch.
Blood vessels are the channels or conduits through which blood is distributed to body tissues. The vessels make up two closed systems of tubes that begin and end at the heart. One system, the pulmonary vessels, transports blood from the right ventricle to the lungs and back to the left atrium.
Explanation:
enzymes for carbohydrates
a insulin
b protease
c lipase
d amylase
Answer:
maybe its B
but dont qoute me on that
Which is the answer?
I thin the answer is b I think I hope I'm sure did u pass it
Cells get energy from minerals like sodium and potassium true or false
Answer:
cells can get energy from minerals
Explanation:
True
Which of the following would NOT increase the rate at which something dissolves? *
A. increase temperature
B. decrease temperature
C. crush solute
D. stir the solution
Answer:
B
Explanation: Decreasing the temperature will not make the increase rate at which something dissolves quicker it would only make it go slower.
Cells and transport proteins are physically prevented from passing through the filtration membrane. This has the following effect on filtration: Cells and transport proteins are physically prevented from passing through the filtration membrane. This has the following effect on filtration: increased osmotic pressure in the filtrate that draws plasma through the membrane decreased osmotic pressure in the filtrate that increases the amount of filtration increasing osmotic pressure in the glomerular capillaries that reduces the amount of filtration neutral change in osmotic pressure with no effect on filtration
Answer:
The correct answer is ''increasing osmotic pressure in the glomerular capillaries that reduces the amount of filtration.''
Explanation:
Osmotic pressure is understood to be the force that must be applied to a solution when the flow of solvent needs to be stopped by means of a membrane with semi-permeable characteristics.Colloidal osmotic pressure in glomerular capillaries: it is the pressure exerted by proteins in the blood, which tends to recover the filtered water. To generate and maintain glomerular filtration, filtration pressure is required. That is, glomerular filtration is a physical phenomenon regulated by hemodynamic changes that affect the glomerulus and, although it is the initial excretion mechanism, it is not the exclusive regulator. Water, ions and some nutrients are mainly reabsorbed in the proximal tubule by different mechanisms. The water will follow a passive transport process by osmotic drag. The activity of the tubule is highly dependent on maintaining a fluid osmotic pressure similar to that of plasma. Since proteins and other elements that participate in the maintenance of the plasma osmotic pressure do not cross the glomerular barrier, in the tubule, the isoosmotic pressure with the plasma is fundamentally conditioned by the content of water and salt (dissociated as chlorine and Na +) of the ultrafiltered.
Cells and transport proteins are physically prevented from passing through the filtration membrane for this the correct answer is to increase osmotic pressure in the glomerular capillaries that reducing the amount of filtration.
Osmotic strain is known to be the pressure that needs to be carried out to an answer whilst the glide of solvent wishes to be stopped with the aid of a membrane with semi-permeable characteristics.Colloidal osmotic strain in glomerular capillaries: it's far the strain exerted with the aid of using proteins withinside the blood, which has a tendency to get better the filtered water. To generate and keep glomerular filtration, a filtration strain is required.What is glomerular filtration?That is, glomerular filtration is a bodily phenomenon regulated with the aid of using hemodynamic modifications that have an effect on the glomerulus and, even though it is the preliminary excretion mechanism, it isn't the different regulator.
Thus it is clear that the above answers are well explained.
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The predicted values for the four phenotypes form a ratio. The simulated values match this predicted ratio.
Answer: 9:3:3:1 and approximately
Explanation: just did it
Answer: 9:3:3:1 and approximately
Explanation: edge 2022
The elements or compounds that are produced by a chemical reaction are called what?
Answer:
Product
Explanation:
When combining two elements or creating a compound, we can call the outcome a product
Darwin's theory of natural selection
Darwins theory of evolution by national selection
more individuals are produced each generation that can survive. phenotypic variation exists among individuals and variation is heritable
A student conducted an investigation to study gravitropism. The control group was planted normally, while the experimental group was planted upside down. After seven days, the control group looked normal. The experimental group after 7 days the roots started to grow toward the direction of gravity. Which statement best explains why the experimental group started to grow toward the ground?
Answer:
gravity?
Explanation:
what is the number of cells at the beginning of meiosis
Please help, any unnecessary answers will be reported. Thanks :)
Rabbits must be always aware of predators that may catch and eat them. In
natural selection what would we consider these predators?
Answer:
There are many rabbit predators that will attack or eat the rabbit, including man. In fact, rabbits have more than most.
Explanation:
Depending in which part of the world you live, will determine the most likely predators you need to be aware of. With domestic/pet rabbits, perhaps the most common predators are pet dogs, pet cats and foxes. However, don't think these are the only ones. Many people are surprised to learn that large birds are a predator to rabbits, especially if the rabbit is a baby, young or a small breed type. Such birds, depending on where you live, include Hawks, Sparrow Hawks, Owls, Falcons, and kestrels. Other rabbit predators include Weasels, ferrets, badgers, stoats and snakes.
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On the bottom of trophic pyramids are ____
1) secondary consumers
2)producers
3) decomposers
4)primary consumers