We start out as two cells then the cells start to split and make more then we have tissues that are layers of cells then they form organs which then form systems then that makes that human body. Because of all of this that creates a human and as you get older you cells keep splitting like when ever you have growing pain your cells are splitting.
An adaptation is when and animal or a person is born in a different environment and their bodies adapt so that they can survive in their environment. With a different environment that know body could live in then we would have to adapt more to it.