Which of the following types of organisms break down dead plant and animal matter and return carbon dioxide to the atmosphere? a) scavenger b) producers c) consumers d) decomposers

The correct answer would be D) decomposers. Decomposers do just what they're named for. Decompose things. They break down dead plant and animal material, gaining nutrients from it, while releasing CO2 into the atmosphere.

c

explanation:

trachea, alveoli, lung capillaries, arteries