The animal prepares for the hibernation ahead of time gathering food and eating so that it can sleep for the extended period of time without leaving
Environment, genetics, selective breeding, random mating, random fertilization, recombination, crossing over, etc
Mutations<span> are changes in the DNA. A single </span>mutation<span> can have a large effect, but in many cases, change is based on the accumulation of many </span>mutations<span>. Gene flow is any movement of genes from one population to another and is an important source of the genetic </span>variation<span>.</span>
