Because they Both work together to filter the water. Also without them Precipitation wouldn't occur and there wouldn't be any water cycle.
D.
It produced reproductive cells.
Trust
You make an educated guess in what you already know about the experiment.
Make sure you hypothesis is testable, It is not a question so dont make it sound like one <span />
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Answer:
The answers would be likely be to a.) improve the environment and b.) cut costs.
