Answer:
relationship between blood flow and the heart rhythm and helped them discover how the heart works
Explanation:
its in the question
<span>Articles of Confederation, 1777–1781. The Articles of Confederation
served as the written document that established the functions of the
national government of the United States after it declared independence
from Great Britain.</span>
D is your answer, hope I was able to help!
D. a campaign volunteer goes through a neighborhood asking for votes,
person to person campaigning