How do living organisms return carbon to the atmosphere in the carbon cycle?

answer; the correct answer is desert plants;

the correct answer, according to e2020, is the second choice there is an occluded front in region a and a cold front in region b.

any abiotic or biotic factor in an ecosystem that causes a population's size to slow or decrease is a limiting factor.

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.