If during your observation of an acutely and severely injured athlete, you note cool, clammy and pale skin; rapid and shallow breathing; and a weak and rapid pulse, you should recognize these as signs and symptoms of

It might be shock or anemia

the answer is yes, they are born/created, then they grow to their limit then produce offspring, then die.

there are so many examples for that in different areas, like biology experiment carried out in our lab recently.

here's one link: