<span>Population crash is a sudden decrease in the number of people found in a given area as a result of shortage or the lack of environmental resources necessary for reproduction, survival and growth of the population. It is also known as a die back. The answer to your question is A. population crash.</span>
I would say Satellites. Satellites are the only thing here I see can measure things globally, the rest is more regional.
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first one i think it is all living things are made of cells
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The Cosmologist have to purchase use telescope so they can see the outside world.
