Answer:
B is true .. atmosphere always changes day by day
<span>The correct answer is a unilinear evolutionary theory.</span>
<span>According to this theory, all societies would pass through the same basic stages, although the speed of transition might vary. The unilinear theory is a social theory, whichconsidersr that Western culture was the most evolved one.</span>
<span>It is 70-80 action potentials per minute. </span>The rate of phase 4 depolarization in
the SA node sets the Heart
rate, <span>The SA node serves as the Pacemaker</span>
It has the greatest automaticity And ability to spontaneously
generate an action potential.
