Which arrow represents the change of state described above

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 individuals have two alleles for a given trait. according to mendel's these alleles are passed down one each from both mother and father.

Why are scientists concerned about the depletion of the ozone levels in the stratosphere?