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A catalyst.
A catalyst speeds up a chemical reaction by increasing the reaction's rate. It does so by decreasing the reaction's required activation energy, which allows the products of the reaction to more easily combine. During this whole process, the catalyst does not change.
i think that the answer is c
Answer: When the northern half of Earth is tilted toward the Sun, the southern hemisphere is tilted away. People in the southern hemisphere experience the shorter day lengths and colder temperatures of winter.
Explanation:
