Answer:
D) four.
Explanation:
The two atria hold the blood that circulates away from the heart. The heart has four one-way valves, which open and close with each heartbeat. The tricuspid valve and the mitral valve are located between the atria and allow the blood to flow from the atria to the ventricles. Also you don't have to but mind marking Brainliest?
Isd is the answer it’s very dangerous
~Hello there!
Your question: How many sperm cells are produced by the average human male?
Your answer: An average human can produced 525 billion sperm cells.
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Prolonged and constant use of tobacco can weaken the user's immune
system and increase the risk of many diseases.. . Which of the following
diseases can makes the air sac in the lungs less elastic, reducing their ability to absorb oxygen?.
B.emphysema.
False. When presenting a presentation you need to be loud enough so that all can here. (This is just an example.)
