<span>The correct answer is B. Pulmonary. The answers C. Cerebral and D. Extremity, are baseless regarding this question; A. Systemic could be a good alternative, as the blood flows from the systemic to the pulmonary circulation in the right side of the heart; but the systemic circulation is in fact mostly handled in the left side of the heart, while the right side handles the pulmonary one. </span>
Answer:
In nature, the oxygen element mainly occurs in gaseous form. While hydrogen is also formed of two atoms and is also a colorless, odorless gas just like oxygen. But hydrogen is generally found as water.
Explanation:
Oxygen and hydrogen are commonly diatomic molecules, not compounds. Hydrogen is the most abundant and light of all elements in the earth. Hydrogen reacts with oxygen to form water. Hydrogen too forms parts of many compounds such as acids, hydrocarbons in organic compounds and so on. About 10% by mass of human body is composed of hydrogen. Oxygen, as it already known is the elements responsible for the survival of living organisms. It forms about 65% of human body by mass.
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C., or disruptive selection. This occurs when the extremes of a trait are selected for, leading to more organisms with those phenotypes in the population.
