B. essential
We cannot store up amino acids on our body, but we can have amino acids through consumption of food. These amino acids of which the body cannot make is called as essential amino acids.
One of the few advantages is In sexual reproduction, more variations are produced. So in turn this ensures survival of species in a population.
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It is false that the bronchial circulation is a component of the pulmonary circulation. Bronchial circulation is a separate system from the pulmonary circulation, and it supplies blood to the tissue of the larger airways of the lung.
