Which of the Following Is NOT True Regarding Food Webs

Multiple Choice

Which of the following is NOT true regarding food webs in ecosystems?

A) primary producers assimilate minerals into biomass
B) primary producers absorb energy from outside the ecosystem
C) grazers convert 10% of carbon back to carbon dioxide
D) consumers convert 90% of biomass carbon to atmospheric CO₂
E) all biomass is recycled and eventually converted to heat