Sound waves<span> coming from farther above, where it is warmer, will experience a refraction. The change in speed from the warmer </span>air<span> to the cooler </span>air<span> causes a bending effect, as the </span>sound travels<span> downward.</span>
D) replicating the DNA strand
hope it is correct
<span>A) they prevent blood from flowing backwards
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An action potential is the variation of the electrical potential associated with the passage of a pulse along the membrane of a muscle cell or a nerve cell.
<h3>What is a nerve cell?</h3>
The nerve cells are the cells involved in the formation of nervous tissue. it helps in the conduction of stimuli through the nervous system.
An action potential is the variation of the electrical potential associated with the passage of a pulse along the membrane of a muscle cell or a nerve cell.
Thus, the answer is action potential.
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