Which best illustrates a result of natural selection?

A most popular example of natural selection is the giraffe's neck becomes longer over time.

Explanation:

Natural selection is a mechanism or process that was presented by Darwin.

Natural selection is a process where organisms that are capable of adapting according to their environmental changes, survive and increase their population through reproduction.

the neck of giraffe has been increased over time because of the higher leaves on the trees. They adapted this trait with a very slow change in the gene frequency as the lower plants and leaves were eaten by other animals.  

Thus, an example of natural selection is giraffes neck becomes longer over time.

i'm guessing this is from edg enuity so the answers would be, from top to bottom,

theodor schwann

matthias schleiden

robert hooke

rudolph virchow

anton van leeuwenhoek