You need to put the answer choices because there is a lot that makes natural selection occur. but without the answer choices i would say a fertile female and made of reproductive age.
Water! It is the source of all life.
Rotation<span> is when a planet or moon turns all the way around or spins on its axis one time. eg. A top that spind around its own axis or turning a screw.</span><span> </span>Revolution<span> is the movement of one object around a center or another object.</span>
Possibly fermentation (lactic acid branch) or cellular respiration.
that is my guess
It would decrease letter b is the awnser
