What is the key difference between a community and an ecosystem.

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.

The following hormone had their receptors in the cell membrane except a-insulin b-tsh c-gh d- cortisol

What did hunter gathers do to alter the environment?