Anatomical Regions, Directions, and Planes

The little lives our cells lead follow a pattern called the cell cycle. Just like how an organism grows, develops, perhaps reproduces, and then dies, our cells do the same. They are growing, developing, and many of them are dividing to make more cells with identical copies of our DNA to replace the old ones. https://youtu.be/skPOXcVvS5c | CrashCourse | Facebook

Genetic drift happens when chance events cause alleles to spike or decline from one generation to the next. Sometimes a segment of a population gets isolated and continues to grow and mutate on it's own. Sometimes populations change as a result of natural disasters or human intervention. https://youtu.be/mFvmY9JASO4 | CrashCourse