Answer: Directional selection occurs when individuals with traits on one side of the mean in their population survive better or reproduce more than those on the other. ... Directional selection does the “heavy lifting” of evolution by tending to move the trait mean toward the optimum for the environment.
No animals don't need light
That property is called h<span>ydrogen bonding. </span>
Which environment are you talking about? is there any answer choices
