Enzymes work to speed up chemical reactions in the body. what do enzymes actually do to speed up reactions? are the reactants and products changed by the enzymes?

Why do we perceive objects as retaining their brightness under different lighting levels?

Which of the following statements is most likely correct about a rock belonging to the jurassic age and a rock belonging to the cambrian age? options: 1) they have identical fossils of organisms that have evolved over time. 2) both have animal fossils preserved in them due to weathering and erosion. 3) they contain different fossils because life on earth has changed through time. 4) the fossils in them were formed on the surface of earth due to exposure to sunlight.

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