What three factors are needed for natural selection to occur? (check all that apply)
a. isolation
b. variation
c. overpopulation
d. adaption

Melting glaciers is a serious threat to the environment what is the possible consequence of melting glaciers on polar bears?

Indicate the coat color and the proportion of offspring with that color for each of the following crosses of rabbits. assume all are homozygous. albino x albino a) 1/4 chinchilla, 3/4, agouti b) 3/4 albino, 1/4 chinchilla c) all albino

Hector is back from his morning run and is feeling light-headed because his energy is depleted which food item will provide him with a quick source of carbohydrates