The answer is <span>atrial depolarization. good luck bro</span>
Answer:
giving a friend a birthday present after they have given you one
Explanation:
<em>Reciprocity</em> means the generosity flows both ways.
<em>Between peers</em> means the participants have the same general characteristic age, education, experience, and so on. <em>Friends</em> are often peers.
Number one is A im not sure about the second one but i believe its c
Microscope changed the course of scientific research by enabling scientist to see things and organism that can not be seen by our bare eyes