Answer:
The answer is Genetic drift and natural selection.
Explanation:
Genetic drift is a change is genetic composition that enhances organisms adaptation to an environment. The continuous change gives an extra advantage and enhances better chances of survival
Natural selection is the process that results in the adaptation of an organism to its environment by relatively reproducing its genes.
This two factors are the major factors that like causes allele fixation
The two major controls system are Nervous system and Endocrine system
Answer:
D
Explanation:
Comets are brightest near the sun.
