How does mass extinction affect species that survive?

there are no surviving species if a mass extinction occurs.

they will soon become extinct.

they combine gene pools.

they fill new roles in the changed environment.

Why are small quantities of chlorofluorocarbons so harmful to the ozone layer? a. the chlorofluorocarbons act like ultraviolet radiation causing large amount of ozone to be produced. b. the chlorine from the chlorofluorocarbons reacts with free molecules of oxygen causing a stop in ozone production c. free oxygen atoms can replace the chlorine in chlorine monoxide, releasing a free atom of chlorine which can then recombine with an oxygen atom in ozone, destroying more ozone. d. chlorofluorocarbons absorb ultraviolet radiation, preventing the formation of ozone select the best answer from the choices provided

If a strand of dna has 35% thymine. what is the percentage of cytosine, adenine, guanine?

The arrows indicate the direction of wind flow. which place experiences monsoons?