1, O because if either shows present it's O.
Except. Bones because it’s abs estructure that’s neuro chemicals can’t affect
Answer:
The biological levels of organization of living things arranged from the simplest to most complex are: organelle, cells, tissues, organs, organ systems, organisms, populations, communities, ecosystem, and biosphere
Explanation:
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~Zero~
The answer is D, serving as a primary source of energy for the body.