All organisms, even plants, perform cellular respiration because select one: a. all organisms need to eat protein b. all organisms need to dispose of nadh c. all organisms need atp for cell work d. all organisms need oxygen

The answer is (D) All organisms need oxygen

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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.