some ecology questions

[person]

hey guys,
i have some questions to answer and i cant find the answers. if you could point out where i could find them or give me a hint it would be greatly appriciated, please and thank you

1. regional variations in the global patterns of rainfall and temperature depend on
a. ocean currents.
b. only two of these are true
c. global air circulation
d.topography
e.all of these are true
*i know its c but what about the other ones?

2. Deserts form in places where air masses are usually
a.cold
b.expanding
c.humid
d.falling
e.rising

3.what is detritus?
a. major source of food for the benthos (true or false)
b.come from the productive surface water of the photic zone (true or false)

thnx for your help

[mith]

http://biology-online.org/forumrules.php

[canalon]

1-But since you seem to have made some research, I will strongly advise you to think of the meaning of "b" if you answer "e". Kind of weird
But then read about el nino and it will clear a few things i guess.

2- think of the Sahara and what kind of climate you find there.