I believe it’s geosphere and biosphere
<span>They bind messenger RNA and transfer RNA to synthesize polypeptides and proteins.</span>
<span>Unidirectional flow in the heart is ensured because the heart contains valves that prevent backflow.
These valves keep the flow of the heart going in one direction (hence the name "unidirectional").</span>
The awnser is b there is a mutation in the gene
