Some bacteria living in the ocean floor can turn methane (a gas) into food. How would you classify these bacteria?
A. producers
B. consumers
C. decomposers
D. both consumers and decomposers

A.  Producers

Explanation:

The methane gas is exuded from the ocean floor, and is thus not a consumer or producer, similar to the sun.  Thus, those that use this power are primary producers.

the solute can move "downhill," from regions of higher to lower concentration, relying on the specificity of the protein carrier to pass through the membrane. this process is called passive transport or facilitated diffusion, and does not require energy.