Idk cause i cant see the whole page
When it is said that mutation is the ultimate source of genetic variation it means that it creates several new combinations which is similar to meiosis and fertilization because <span> new alleles and genes appear. It is just about some common points.</span>
TCA ATG CGT IS THE ANSWER.
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It would be uracil (C)
thymine would be complementary to adenine in DNA but because it is RNA it is replaced by uracil.