Name the three major types of formed elements found in blood

Which conditions are necessary for natural selection to occur? select all of the answers that apply. a. inheritable adaptations vary among individuals. b. the population size is increasing. c. more individuals are born than can survive. d. fitness varies among individuals. e. the environment changes suddenly and drastically.

Many animals cannot sweat to maintain a stable body temperature. what is one other way animals can cool down?

They live on every continent except antarctica