main function of vitamins

Question
1. Which of the following is a main function of vitamins?
a) Providing structure to cell membranes
b) Supplying the brain with an energy source
c) Facilitating the action of enzymes
d) Promoting the absorption of carbohydrates

2. A student wants to design an experiment to demonstrate the effects of acid rain on plant life. Which of the following substances should be combined with water to best simulate acid rain?
a) Vinegar
b) Table salt
c) Baking soda
d) Ammonia

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