Adult stem cells are rare. Their primary functions are to maintain the steady state functioning of a cell—called homeostasis—and, with limitations, to replace cells that die because of injury or disease
It's just like wolves, they can get more work done if they work together.
Organisms that use the same resources because there may not be enough for all, so it then becomes a competition of who gets it and who doesn't.
When fossil fuels are burned they can cause pollution which can cause global warming.
