The source of variation in a species is

A)Carbohydrate
B) DNA
C)Protein

What are genotypes? what are phenotypes?

What is the cause hearing loss in human being

Migration is a. the movement of organisms from a native location to a foreign location b. the movement of organisms from a foreign location to a native location the movement of organisms from their water supply to their food supply d. the seasonal movement of organisms between locations c. select the best answer from above