The answer is hydrogen and oxygen
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<span>In marine vertebrates, the gill arches use the external gas exchange. The water holds less oxygen.
The ribs in terrestrial vertebrates have enclosed respiratory surface which is inside the body and comes as paired lungs.
Kidneys are efficient in excretion of regulation of water and nitrogenous wastes. Their reproduction is normally sexual with separate sexes.</span>
The two groups that are prioritized are children aged from six months to four year and senior citizens aged 50 and up.<span />
Answer:
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Explanation:
