Approximately, how much energy would be available to the primary consumers per year?

Answer 1

This can vary greatly depending on the specific ecosystem and food chain being considered. In general, only about 10% of the energy available at each trophic level is transferred to the next level. This means that if the primary producers in an ecosystem produce 10,000 units of energy in a year, only about 1,000 units of energy would be available to the primary consumers.