The answer is; cell surface receptors that are recognized as antigens by the recipient's immune system.
Therefore the organ is attacked as a foreign substance . This is why organ transplants are given by the closest family member to reduce the antigen variability that causes transplant rejection. Tissue typing is done to ensure that the organ or tissue is as similar as possible to the tissues of the recipient.
The answer is B. Population
The both decrease genetic variation
Answer:
Overpopulation in the area's main source of prey, such as rabbits, mice, etc.
Explanation:
A hawk is a predatory creature. That means that it feeds off of prey, such as mice or rabbits. In the case that the population saw a sudden decrease, the population sizes of the hawk's main source of prey would increase due to hving less of a threat towards their own survival.
