Answer:
yes
Explanation:
Elodea plant: no
Mushroom: yes
Snail: yes
Plants like trees, elodea plants, (or almost any plant), take in carbon dioxide and release oxygen into the atmosphere.
Decomposers like mushrooms release carbon dioxide when decomposing dead material.
Snails eat plants and release carbon dioxide in a same functions as almost all living animals.
Red blood cells exchange carbon dioxide for oxygen