The DNA unravels to make two strands
The answer for the above question is Valvular prolapse. It is the normal protrusion of the heart valve, that results in the inability of the valve to close completely. The valve function to prevent the back flow of blood, in this condition the valves do not close smoothly or evenly, but instead bulge upward into the left atrium. Due to the condition some blood may flow backward through the mitral valve with each heart beat.
Each lung consists of millions of tiny air sacs called alveoli.
<span>Each air sac is surrounded by a tiny blood vessel called an </span>arteriole.
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unequal warming and cooling of land and sea
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Answers:the tendency towards a relatively stable equilibrium between interdependent elements, especially as maintained by physiological processes.
Explanation:
the tendency towards a relatively stable equilibrium between interdependent elements, especially as maintained by physiological processes.