Eukaryotes are organisms whose cells have a nucleus enclosed within a nuclear envelope.
Random fertilization allows random combination of genetic information, which helps synthesize genetically unique gametes. The fusion of a unique sperm together with a unique egg can introduce further variation.
A clade is a group of species that includes an ancestral species and all of its descendents
It is better for the whales to go where the whales have the ability to dive longer and deeper to find cooler water.
