Answer:
They speed up chemical reactions. Without them you wouldn't be alive. They break down macromolecules, and also lower the amount of energy needed for a chemical reaction to happen.
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Answer:
62°F (17°C) to -60°F (-51°C) at the tropopause.
Answer:
a plant that is characterized by the presence of conducting tissue.
Explanation:
I would say d. Multi-part protein that reversibly binds to oxygen molecules (...)