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Both molecules and compound area made up of atoms . Two or more atoms joined together by shared electrons form element.Substance made from two or more than two different elements are compounds.

Explanation:

Hence, the complete statement would be :

Both molecules and compound area made up of atoms . Two or more atoms joined together by shared electrons form element.Substance made from two or more than two different elements are compounds.

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.