Answer:
people effect the enviroment, and the enviroment effects people
The advantage of wind power is that it's a non- polluting energy source.
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Answer:
A hydrometer is a instrument used to determine specific gravity. It operates based on the Archimedes principle that a solid body displaces it's own weight within a liquid in which it floats. Hydrometers can be divided into two general classes: liquids heavier than water and liquids lighter than water
B? Human population are sometimes concentrated in areas that are lacking resources