Are you sure these are the only answer choices? I believe the answer would be Hippocampus, but it's not up there.
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>
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Stem cells are special human cells that have the ability to develop into many different cell types, from muscle cells to brain cells. In some cases, they also have the ability to repair damaged tissues.
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Dean Winchester is the older of the two Winchester Brothers, he fights monsters.
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