Greenhouse
gases
affect Earth by:
O A. keeping heat from radiating back into space.
B. cooling the other gases in the upper atmosphere.
C. undergoing chemical reactions that give off heat.
D. allowing gases from volcanoes to leave the atmosphere.
bac
The concept of keystone species is controversial among ecologists because most organisms are highly interdependent. if each of the trophic levels is dependant on all others how can we say one is most important