The first thing Fiona, or anyone, should do is form her hypothesis.
The hypothesis is your own proposed explanation for whatever phenomenon you're trying to study. Think of it as a predetermined idea of what could happen based on what you already know.
Oxygen
Oxygen
Carbon dioxide
Monoxide
I hope I helped
Energy is stored in the organelle mitochondria and is released by the process of ATP. Usually the release of energy can be evident by the appearance of respiration.
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