According to data from the National Survey on Drug Use and Health (2006), in the 18 to 25 age group, which of the following substances had the highest usage? a. ecstasy
b. cocaine
c. alcohol
d. marijuana

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Explanation: If a plant's soil has too much water, the roots can rot, and the plant can't get enough oxygen from the soil. If there is not enough water for a plant, the nutrients it needs cannot travel through the plant. A plant cannot grow if it doesn't have healthy roots, so the proper balance of water is key when growing plants.