I would say that it's oxygen.
Tcgagtc its the complementary strand....a almost always(does not sometimes if there is a mutation) binds with t and g binds with c
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If you study ecology then you are studying plants
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I'm not sure what the options are but rna or ribonucleic acid is made up of a nucleobase called uracil instead of thymine (which is what dna has). It kinda looks like half of dna.
