During the diumal cycle insolation peaks
a. each december
b. each june
c. each day at midnight
d. each day at noon

D. each day at noon

Explanation:

During the diumal cycle, insolation peaks each day at noon.

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.