Natural Selection is when a living thing is born with something different than the rest of their species (more fur, longer neck or legs, ect) that gives them an advantage and helps them live better and longer in their enviroment. They pass it onto their children and their children pass it onto their children making a different species.
*the rat snake has different populations in eastern North America. All compromise one specie because mating can occur between adjacent populations causing to share a common genepool.
**are well documented both by obsserving and through the fossil record!**
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