30. Which of the following best explains why enzymes are necessary for many cellular reactions? A. Enzymes supply the oxygen necessary for the reactions.
B. Enzymes change reactants from solid to liquids during the reactions.
C. The reactions take up too much space in the cell if the enzymes are missing.
D. The reactions are too slow to meet the needs of the cell if enzymes are missing.

Explanation:

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D. The reaction are too slow to meet the needs of the cell if enzymes are missing

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answer; i believe that the correct answer is ; males are hemizygous for the x chromosome;

the water is warmed up by the sun and then it evaporates into the atmosphere. the sunlight warms the water by its heat. water is then cooled down and condensation takes place. the water then finally returns back to the earth by the process of precipitation in the form of rain or ice.

explanation: