Messenger RNA (mRNA) molecules carry the coding sequences for protein synthesis and are called transcripts; ribosomal RNA (rRNA) molecules form the core of a cell's ribosomes (the structures in which protein synthesis takes place); and transfer RNA (tRNA) molecules carry amino acids to the ribosomes during protein.
Can accumulate over generations so that descendants are very different <span>from their ancestors
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Circulatory and Respiratory systems working together to provide body with oxygen.
