Oxygen is the gas humans and animals need to breathe in.
oxygen
Methane is given off by animals as a waste gas.
oxygen
oxygen
Oxygen.
Oxygen
I don't think it is a gas when inside the plant, but most animals/plants need it.
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Yes, all animals need to release gas from their body.
Animals need oxygen to carry out life processes. Plants need carbon dioxide. Some animals and plants can use either if they need to.
Plants let out gases. This gas is called oxgen which animals and humans need to breathe so we can live. Animals let out a gas called carbon dioxide and the plants need to take in the carbon dioxide to live.