Answer:
Option B, most changes from generation to generation are the result of mutations
Explanation:
Through the process of evolution, an individual changes from one generation to other generation. These variations are caused by genetic changes.
Genetic variations are caused by -
a) Genetic mutation
b) genetic recombination
Genetic variation leads to alteration of gene or protein function due to which differences traits arises in an organisms. Thus , it can be said that genetic mutation brings variation in structure and thus leads to evolution of any species.
As long as generations of individuals with the newly developed trait continues to mate and reproduce, new trait becomes common in a population.
Hence, option B is correct
acidic water is not an consequence of early spring but an effect on marine ecosystems.
Answer: Antigen
The antigen are proteins in the cells of the body.Out of over 100 different antigens that have been identified, there are six that have been shown to be the most important in organ transplantation. Of these six antigens, we inherit three from each parent. It is rare to get a six-antigen match between two people, especially if they are unrelated. HLA(human leucocyte antigen) typing is done before the transplant to ensure high probability of success.
A person can make antibodies against another person’s HLA antigens. If a recipient has strong antibodies against a donor’s HLA, the risk of rejection is high and a donor would be declined for that recipient. so the type of antigens are tested for the compatibility before a transplant to ensure high probability of success and lower the rate of rejection.
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movement through a cell membrane using energy from ATP
movement of particles from a region of high concentration to a reaigon of low conentration
movement of particles from a region of low concentration to a regoin or to a high region
Answer:
Option (3).
Explanation:
The molecules may transport from inside and outside of the cell from their region of low concentration to high concentration or vice-versa. Different types of transport process are diffusion, osmosis, primary active transport.
Diffusion occurs naturally in the organism and no energy is required for its transport. The molecules move to the region of lower concentration from its region of higher concentration. The molecules moves along the concentration gradient.
Thus, the correct answer is option (3).
B) cold winters and cool summers.
C) located in the northern hemisphere.
D) a layer of frozen soil called permafrost.
Answer:
The correct answer would be A) many coniferous trees.
Taiga and tundra represent the two coldest biomes of the land on the planet.
The average annual temperature of taiga lies between 41° Fahrenheit and 23° Fahrenheit whereas the temperature of the tundra lies below 23° Fahrenheit throughout the year.
It makes the major difference between the plant life of the two biomes. The taiga is characterized by the presence of coniferous forests which consist of spruces, pines, and larches.
In contrast, vegetation in the tundra is mainly composed of grasses, shrubs, mosses, sedges, and lichens.
Answer:
Once a virus enters a cell, it hijacks the cell's machinery to replicate itself. However, it does not directly change the instructions in the cell's nucleus.
Explanation: