Which of these are not a challenge that fish face out of the water? A. Maintaining buoyancy
B. land predators
C. Breathing air
D. Physical damage like scrapes

glycolysis

explanation:

glycolysis must occur before any of the other steps can occur.

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in a chemical reaction, the atoms and molecules produced by the reaction are called products. no new atoms are created, and no atoms are destroyed. in a chemical reaction, reactants contact each other, bonds between atoms in the reactants are broken, and atoms rearrange and form new bonds to make the products.