All over - but most critically in the brain and heart muscle.
Oxygen is the gas humans and animals need to breathe in.
Humans need to bring food, water, oxygen,
oxygen
YES as humans we need oxygen to breath
oxygen...
Absolutely. It's what we breathe.
oxygen
We are humans and we need Oxygen to survive!
In order to live.
Need oxygen to release energy into bloodstream.
Food,oxygen, & water
because they don't work as hard as humans do