describe the evolutionary stages of magma development from the base of the over riding plate to the moho and then to a magma chamber lying beneath an active volcano pls help i am stuck

the answer is true when observing or determining population size, a direct observation is use, in which each organism is counted in a population or in an area. one benefit of this measure is that you get the exact population count but it will take a long time to  determine  the  size  of a  population.

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