I may be wrong but I think it’s the second one. They speed up reactions, and there’s a certain enzyme for a certain reaction.
It would be the endocrine system.
Answer:
At 40x, Stella could see the cells, but they will look really small. At 100x, Stella was able to see the cells to the point where she could see most of them up close. At 400x, Stella could see the cells one by one close enough. Some of the cells are shoe-shaped, which is one of the characteristics of paramecium. The brown at 400x next to the orange is the one that mostly looks like a shoe.
Explanation:
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Deoxyribose I think. Because DNA literally means Deoxyribonucleic acid. While RNA stands for ribonucleic acid, which means it contains ribose. hope this helps in the future.