In any ecosystem, terrestrial or aquatic, which of the following are always necessary?

Question

Quizplus · Accepted Answer

Autotrophs are always necessary in any ecosystem as they produce their own food through photosynthesis or chemosynthesis. Heterotrophs depend on autotrophs for their food, and hence they are also necessary, but not always present in an ecosystem. Producers like green plants and photosynthesizers are also necessary, but autotrophs cover a broader category that includes non-green plants, like chemosynthetic bacteria. Hence, D is the best choice.

In Any Ecosystem, Terrestrial or Aquatic, Which of the Following