Choice C. Educated guess or a prediction that can be tested, based on limited evidence.
Answer:
In the case of catalase, the optimum pH is approximately pH 7.0. That is, catalase works best at a neutral pH. If the solution is too acidic (low pH value) or too basic (high pH value) the catalase is inactive and no longer functions as an enzyme.
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Explanation:
Classification of living things takes into consideration of everything, except A. The number of cells the organism is found to have.
Neurotransmitters is the word you're looking for.