In Any Ecosystem,terrestrial or Aquatic,what Group(s)is (Are)always Necessary

Question

In any ecosystem,terrestrial or aquatic,what group(s)is (are)always necessary?
A)autotrophs and heterotrophs
B)producers and primary consumers
C)photosynthesizers
D)autotrophs
E)green plants

Accepted Answer

Autotrophs, also known as producers, are always necessary in any ecosystem as they are the foundation of the food chain/web and convert energy from the sun into organic compounds that can be used by other organisms. Without autotrophs, there would be no energy input into the ecosystem and it would collapse. While heterotrophs and consumers are also important for the food chain, they can only exist if autotrophs are present to provide energy. Likewise, while photosynthesizers and green plants are types of autotrophs, not all autotrophs are photosynthetic or green.