When exercising, you should

a. work through any pain that you experience.
b. plan to take in extra water.
c. plan to take in extra protein.
d. avoid wasting time with a warm-up.

answer: a . wheat cereals b eggs.   c. citrus fruits.

explanation:

b) the heart is a pump made of muscle and that is difficult to grow in the lab.

answer; /// an alphabetical list of sources arranged according to a citation style and followed by a summary of the content;

answerechocardiography;