The diagram below shows the results of crossing a pea plant with smooth seeds and a pea plant with wrinkled seeds.

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.

All living organisms are composed of a. only one cell. b. at least 100 cells. c. at least three cells. d. one or more cells.

What substance is the most acidic. lemon juice. tomato juice. sodium hydroxide. water