A. Community.
This is because a community contains living this, and biotic means living.
The astronomical unit, otherwise known as AU is used to measure long distances in the universe.
In photosynthesis oxygen is released to the atmosphere which means the third option is correct.
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Answer:they monitor it through a modern system machine, it's important because we need to know the population we have.
Explanation: which means are we increasing it reducing in our population
Answer:
Ocean phytoplankton produce almost half of earth's atmospheric oxygen
