Answer:
The primary role of the carbonic-acid-bicarbonate buffer system is to neutralize the hydronium ions forming carbonic acid and water when any acidic substance enter the bloodstream.
Explanation:
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D. Volcanoes formed most of them through eruption.
Suspension. The particles are big enough for the eye to see, and will separate if left sitting.
When oxygen and hydrogen combine they form a polar covalent bond
