Animal dander would be the answer you're looking for.
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Answer:
c. Hydrogen
Explanation:
Do I really need to explain...
Answer:
Enzymes are catalysts for chemical reactions in living things. Enzymes, like other catalysts, lower the activation energy and increase the rate of chemical reac- tions. ... This means that enzymes do not change the direction of a reaction— they just change the amount of time needed for equilibrium to be reached.
Explanation:
