Cnsname a part of the central nervous system, and say why it is important.

the heart

Explanation:

because you need it to pump blood

desert perennials often survive by remaining dormant during dry periods of the year, then springing to life when water becomes available. most annual desert plants germinate only after heavy seasonal rain, then complete their reproductive cycle very quickly.

and after water is usually warmed by the sun the water temperature raises and then evaporates .