What is the name of the gas animals breathe out?

carbon dioxide

i think

The gas is called carbon dioxide. Because they breathe in oxygen then let out carbon dioxide that is put into the atmosphere.

Hope this helps :)

the generally accepted parts of modern cell theory include: all known living things are made up of one or more cells. all living cells arise from pre-existing cells by division. the cell is the fundamental unit of structure and function in all living organisms.

the principles and empirical processes of discovery and demonstration considered characteristic of or necessary for scientific investigation, generally involving the observation of phenomena, the formulation of a hypothesis concerning the phenomena, experimentation to test the hypothesis, and development of a conclusion that confirms, rejects, or modifies the hypothesis.