All species have a certain amount of genetic diversity within their populations. how is genetic diversity important to the concept of natural selection?

Without genetic diversity, natural selection cannot occur.

Explanation:

Natural selection could not occur if there was no genetic diversity amongst species. Furthermore, the process of natural selection, which leads to speciation, can enhance the genetic diversity of species.

1. glaciers are melting

2. more water going into ocean (water's such as fresh waters, etc)