Students are using beads of different colors to represent the molecules in food. The beads can be connected in chains in
different arrangements to represent different kinds of
molecules.
What is the best way for the students to use the beads to
represent the processes of photosynthesis and cellular
respiration that allow plants and animals to get the energy they
need?

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explanation:

bc blah

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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.