Answer:With this system, blood always flows in only one direction inside the heart. There are also valves at the bottom of the large arteries that carry blood away from the heart: the aorta and the pulmonary artery. These valves keep the blood from flowing backward into the heart once it has been pumped out.
Explanation:
Answer:
b eating improperly cooked food
Explanation: salmonella e-coli etc
Get vaccinated
Wash your hands/ use hand sanitizer
Wear a mask around sick people
Get plenty of sleep
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I believe the answer is national state and health standards
Lets see if i remember them all.
okay, nervous, skeletal, muscular, um...the blood one(i forget what its called)
and i think thats it
