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Biology 21 Online
OpenStudy (anonymous):

In humans, the instructions for reproducing and operating the individual are found in the combination of three of the following bases: adenine, guanine, cytosine and thymine. Which of these are common to dogs and cats as well as humans? I. Adenine II. Guanine III. Cytosine IV. Thymine

OpenStudy (anonymous):

1,3

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