An embryonic stem cell is the first cell in the embryo, this is what creates a human and helps more cells to form.
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At sea level, air pressure is greatest because it is caused by the weight of the entire column of atmosphere at that altitude over that location. As altitude increases, the column of atmosphere gets shorter, and so less weight is pressing down at a given altitude, so atmospheric pressure is reduced.
It is called a population since they are all the same species
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Carbon dioxide and methane.
