Odd one out: a) ch3coohc) cuso4b) naohd) h2so,

Decomposers release carbon dioxide into the air as waste.

Decomposers break down the remains of dead plants and animals.

Decomposers return carbon compounds to the soil.      

Explanation:

Decomposers: In any carbon cycle, the term "decomposers" is described as an organism that is responsible for breaking down various dead material from any animals or plants and therefore tends to release "carbon dioxide" into a specific atmosphere, where it is being available for plants in order to do photosynthesis.