The answer is A. RNA polymerase will be making an mRNA using a single DNA strand as a template. So, for example if the DNA strand is AGGCAGC the mRNA strand will be UCCGUCG.
U= uracil which replaces thymine in mRNA molecules.
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Answer:
2 materials are exchanged between fetal and maternla blood
Explanation:
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The answer is C. They destroy the ozone layer
