Answer:
The heart is a muscular organ about the size of a fist, located just behind and slightly left of the breastbone. The heart pumps blood through the network of arteries and veins called the cardiovascular system.
B is the answer to this question
<span>So they can identify what every gene does, and possibly cure genetic diseases before someone gets them.</span>
Doing enjoying activities
Talking to friends
Writing things down to relieve stress
