A. Your leg jumping when it is hit by a reflex hammer
Having one theory is setting a limit on your potential and the potential of the overall theory and subject you are working on. Having multiple theories gives you a broader idea and perspective of what is going on, and even though one may slightly contradict the other, it is okay because that is what theories are for.
To the point, scientists usually have more than one theory so that they can gain a broader perspective on the matter and maybe even increase the chance of being correct on the matter.
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D. He controlled variables by studying one or two traits at a time
Most of the digested food is absorbed in the small intestine-- while the large intestine functions largely to reabsorb water.
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