In any ecosystem, land-based and aquatic, matter, in the form of atoms and molecules, is cycled among all organisms. Organisms within every food web, have specific roles in continuing the cycle of nutrients.

In any food web, the organisms that are responsible for converting raw energy into usable chemical energy are collectively called ________ while organisms that recycle the nutrients trapped in dead organisms are collectively called
A) producers; consumers.
B) producers; decomposers.
C) heterotrophs; consumers.
D) heterotrophs; autotrophs.