a motorcycle accident the rider broke three ribs and one of them punctured his chest wall. The rider will find it very difficult to inhale because

Cells tend to have a relatively small and uniform size. why aren’t cells larger?

This is the diveristy of ecosystems natural communites and habits it is the variety of ways that species interact with each other and their environment

Compare the shapes of the bones of the human skull with the shapes of the bones of the human leg. how do the shapes differ? why are the shapes important?