(A) nerve cords, because adults lack a notochord (a dorsal hollow nerve cord).
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They need energy to produce oxygen
C. They unwinds the two strand of DNA.
Answer:
Function:
mRNA: mRNA can be described serves intermediate molecule between the genetic material and the amino acids for the making of protein.
rRNA: It makes up the ribosomes along with the ribosomal proteins. Ribosomes are the sites where the process of translation occurs.
tRNA: The tRNA is involved in the bringing of the nucleotides to the ribososmes for translation.
