Your answer would be $4 times $y.
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The first three are the same as those found in DNA, but in RNA thymine is replaced by uracil as the base complementary to adenine. This base is also a pyrimidine and is very similar to thymine. Uracil is energetically less expensive to produce than thymine, which may account for its use in RNA.
The answer will be a plant! Almost ever other organism gets its energy from another organism where as plants get theirs from sunlight, water, oxygen, and other non living things