Answer:
If the system is the reactants/products, the temperature would increase.
If the system is the surroundings in which the reaction is occuring, the temperature would decrease.
Explanation:
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I've checked all the options and I think that the right answer looks like this: Mollusks have highly developed olfactory receptors.
The answer is Actin, tubulin, Titin
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The three most common elements are oxygen, carbon, and hydrogen
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