Organisms at the bottom of the pyramid produce enough usable chemical energy to support the entire ecosystem a). predation reactivate b). photosynthesis c). cell respiration d). anaerobic respiration

The correct answer is letter B. They use photosynthesis to produce chemical energy to support the entire ecosystem. Hope this answer helps. Good luck!

The virus is considered to be are living item since they have hereditary material dnas or rnas. they can imitate and change. they respond to boosts, for example, radiation, chemicals, and warmth. they have antigenic properties. they are proficient to duplicate with a same hereditary constituent.