Organisms living in the oceans are provided with a relatively constant environmental temperature. in order for plants and animals to make the move to land, a high cellular was critical to maintain a relatively constant internal temperature.

Organisms living in the oceans are provided with a relatively constant environmental temperature. In order for plants and animals to make the move to land, a high cellular microorganism was critical in helping to maintain a relatively constant internal temperature. Microorganisms help in balancing the temperature.