Natural selection is the differential survival and reproduction of individuals due to differences in phenotype. It is a key mechanism of evolution, the change in heritable traits of a population over time. The term "natural selection" was popularised by Charles Darwin who compared it with artificial selection, now more commonly referred to as selective breeding.
Nervous system is divided into parasympathetic and sympathetic
Directional selection acts against b<span>oth extremes simultaneously in the variation of the trait. This is the most "aggressive" form of selection and only happens in extreme areas.
</span>
1.) D.
2.) B.
3.) D.
4.) A.
5.) B
Oops I accidentally hit the two stars :( these are right
