In any ecosystem, terrestrial or aquatic, what group(s) is (are) always necessary?
a. autotrophs and heterotrophs
b. producers and primary comsumers
c. photosynthesis
d. autotrophs
e. green plants
Answer: D
In any ecosystem, terrestrial or aquatic, what group(s) is (are) always necessary?
a. autotrophs and heterotrophs
b. producers and primary comsumers
c. photosynthesis
d. autotrophs
e. green plants
Answer: D