Blood enters the heart through two large veins, the inferior and superior vena cava, emptying oxygen-poor blood from the body into the right atrium of the heart. As the atrium contracts, blood flows from your right atrium into your right ventricle through the open tricuspid valve.
Answer:
3. Solo running
Explanation:
DeMarquis is looking for a solo and noncompetitive sport.
The only solo sports here are 3 and 4.
Boxing involves competing with others in a ring, so 3 is the only answer left.
No habla engels is the answer
