F. Cohesive behavior.
This is the unification of similar molecules within the molecular structure of an organism.
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.
The answer is
D. another natural disturbance
Okay, let's see...
In the center, we have the inner core, then the outer core, and then the slow moving mantle. On the outside, we have the crust a.k.a. where we live. =]
