Answer:
Oxygen enters the lungs through the trachea, which branches into two tubes called the bronchi, which lead to the lungs.
<span>The heart has two receiving chambers (the right and left atria) and two outgoing chambers (the right and left ventricles).</span>
D)...... Hope it helps, Have a nice day:)
<span>They bind messenger RNA and transfer RNA to synthesize polypeptides and proteins.</span>
