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A2. Below are the chemical structures of fat, vitamin C, and THC (the active ingredient in the drug marijuana). The fat and THC molecules contain lots of carbon atoms, which makes them very nearly nonpolar. Chemicals that are fat-soluble are retained in fat cells for long periods of time. Chemicals that are water-soluble are quickly excreted by the body. Explain the following: (a) A person who uses marijuana will test positive for THC for several weeks after using this drug. Why? (b) The recommended daily allowance of vitamin C is 3 g/day. Why should vitamin C be consumed every day?