Answer:
a
Explanation:
Remember, a biotic factors are those that are living (having life in them), while the abiotic factors are not living organisms.
Oxygen is in the category of biotic and it interacts with the atmosphere (space) which is abiotic.
1) Oxygen
2) Carbon
3) Hydrogen (water)
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Fat, more specifically, triglyceride which are the main constituents of natural fats and oils in humans and other animals
They started as monkeys and then via acquired traits overtime they became humans
