Question

what would happen if algae, cyanobacteria, and plants were wiped out? carbon dioxide would be rapidly released from dying autotrophs. oxygen levels would rise. heterotrophs would convert to autotrophs. heterotrophs would not be able to use autotrophs as an energy source. autotrophs would not be able to use heterotrophs as an energy source.

Explanation:

Algae, cyanobacteria, and plants are autotrophs that perform photosynthesis, providing energy - rich organic compounds for heterotrophs. Without them, heterotrophs would lose this energy source. Autotrophs don't use heterotrophs as an energy source in normal circumstances. Heterotrophs can't convert to autotrophs easily. Oxygen levels would drop as there would be no photosynthesis to produce oxygen. And while some carbon - dioxide might be released from dying autotrophs, the main consequence for heterotrophs is the loss of an energy source.

Answer:

Heterotrophs would not be able to use autotrophs as an energy source.