To Best Use the Earth's Net Primary Productivity to Feed

Multiple Choice

To best use the Earth's net primary productivity to feed the most people,diets should be modified to include ________,and gathering the maximum amount of energy available from a given biomass of producers.

A) only meat,moving higher up the food chain
B) only meat,moving lower down the food chain
C) plant material only,moving lower down the food chain
D) plant material only,moving higher up the food chain