why are primary producers also referred to as autotrophs? a. they are able to transport energy throughout an…

why are primary producers also referred to as autotrophs? a. they are able to transport energy throughout an ecosystem. b. they are able to change chemical energy into light energy. c. they are able to transform energy from an unusable form to a usable form. d. they are able to release energy from other organisms in an ecosystem.
Answer
Brief Explanations:
Autotrophs, like plants, perform photosynthesis or chemosynthesis to convert energy from sunlight (or chemical - energy sources) into chemical energy in the form of organic compounds. They take energy in an unusable form (sunlight or certain chemicals) and make it usable as food energy for themselves and other organisms in the ecosystem.
Answer:
C. They are able to transform energy from an unusable form to a usable form.