Which federal agency the encompasses the cdc, fda, and nih?
spca
epa
hhs
usda

HHS (Health and Human Services) is the correct answer.

US Department of Health and Human Services is the federal agency which aims at protecting the health of people of America and providing essential human services. Under the umbrella of this federal agency, several organizations work which include CDC (Centers for Disease Control and Prevention), FDA (Food and Drug Administration) and NIH (National Institutes of Health).

i can't see the full page, therefore, can't answer it

explanation:

genetic variation can be caused by mutation (which can create entirely new alleles in a population), random mating, random fertilization, and recombination between homologous chromosomes during meiosis (which reshuffles alleles within an organism's offspring).