You are a research scientist trying to determine if the genes controlling bone density can be affected by environmental factors. What would be most useful to your research? A. Siblings to study B. X-ray machine C. Identical twins to study D. Mass Spectrometer

when a reversible reaction is occurring in both directions at the same rate; the products and reactants do not change in concentration. a chemical reaction where the compound is broken into its constituent parts.

explanation:

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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.