The percent of usable energy transferred as biomass from one trophic level to the next is called ___________________________________.

Usable Energy

Energy in forms that can be directly used by humans or converted to other forms of energy for work, including mechanical, electrical, and chemical energies.

Biomass

The total mass of all living organisms in a specific area or volume; often used as a renewable energy source derived from plant and animal material.

Trophic Level

The position an organism occupies in a food chain, defined by the number of steps it is from the primary source of energy (usually the sun); it indicates the organism's role in the transfer of energy and nutrients through an ecosystem.