Answer:
I'm pretty sure the answer is natural selection.
Explanation:
Natural selection acts on phenotypic variations in populations.
It’s the first one for sure
http://1kai.dokkyomed.ac.jp/mammal/en/genus_list.html
Within any ecosystem, there is a fixed amount of energy available for
organisms to use. since organisms usually produce more offspring than a
given
ecosystem can support, this causes competition. They compete over who will be the dominant one and who will be left to die.
Day and night sunrise and sunset is based on the rotation of earth on its axis
