is the species that plays an especially important role in its community so that major changes in its numbers affect the population of many other species in the community A. Prey
B none of the above
c predator
D keystone

please answer quickly and be 100% sure its correct

D. Keystone

Explanation:

Think of it from a bridge building perspective the keystone in an arc bridge was the tip or the highest point if that stone was pulled out all of the other stones would fall out with it, same goes for ecosystems if that one species declines dramatically or goes extinct then the rest of the population will proceed to do so as well

answer; /// i believe that the correct answer is ( monophasic ); ethinyl estradiol- ethynodiol diacetate is a monophasic oral contraceptive agent; ///