But humans- and a great many other species- don't just go to the mess hall to eat.

This species goes through a number of stages in its development.

"If the environment is suitable, a species can go on for a long time."

This is another way of saying that many present species would go extinct.

Can we really afford to let these species go extinct?

"No species would go to war just because you asked them to," Jared said.

All species are adapted to their dry conditions and can go for months without food or water.

And when two species are no longer going to be cooperating, what does it really matter about the others?

One is that not all species are going to make it.

"A species goes out of existence every 20 seconds," she says.