Develop a timeline to show the history of the development of cell theory from inception to modern day. Include the contributions of Hooke, Malphigi, Grew, Van Leeuwenhoek, Milne-Edwards, Dumortier, Schleiden, Schwann, Virchow, Purkyne (also spelled Purkinje), and Porter.

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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it's made from mineral oil