Which of these statements about energy flow in ecosystems is false?

(a) Energy from sunlight enters the biotic world when plants and other photosynthesizers use it to build organic molecules.

(b) Tropical forests and coral reefs have high primary productivity.

(c) About 90, of the energy at one level of the food chain moves up to the next level of the food chain.

(d)When a consumer eats, the energy it receives from food goes into feces, maintenance, and building biomass.