Plasma membrane which is also the cell membrane
Answer:
Answer is Sinoatrial node, SA.
Explanation:
The sinoatrial node, SA, is known to be a group of cells which are found at the top of the heart.
The electrical signal that is initiated by the sinoatrial node bring about or stimulates the atria and then the ventricle of the heart.
It should be noted that, the sinoatrial node are regarded as the pacemaker cells.
<span>The answer to 10 is A as liquids expand with an increase in temperature. 12. Not able to answer. The answer to 17 is A as a the two different metals expand and contract at different rates when heated and cooled.</span>
Lysosomes looks like a little particles of circle layer covering, placed within the cell's sac.
D is what he probably thought but it all depends on genetics so if they did stretch out the kid would still have a short neck to it would be A
