Answer:
The populations are isolated and thus do not interbreed.
Explanation:
The fourth one that looks like an M. This is because it describes changes in population genetics in which extreme values for a trait are favored over intermediate values. In this case, the variance of the trait increases and the population is divided into two distinct groups.
Due to their nature of learning from the cells around them, stem cells could literally regenerate any part or muscle in the body! They could regrow body parts, become immune system cells and boost your immune system, it could fix things like brain damage and so much more than I can think of off the top of my head! This could change mankind as we know it forever!
For bones to function, they need muscles and for muscles to function, they need bones.