15 Activation energy is the energy that a system must have before a chemical reaction can occur.? True
False

List two limitations of natural selection

Directions: read the descriptions of the four islands presented in the lesson. 1. list two new traits that each new species of rat might demonstrate as it adapts to the conditions on each island. 2. introduce one of the four new rat species to another island and describe one challenge it would encounter and one success as it adapts to its new environment.

When listening the levels of orginization in orginisims from the smallest to most complex , which level is just below organs in complexity