How is a virus different from a bacterium? A. A virus causes illness, but a bacterium does not.
B. A bacterium is a living cell, but a virus is not.
C. A virus is a living cell, but a bacterium is not.
D. A bacterium causes illness, but a virus does not.

option B

Explanation:

On a biological level, the main difference is that bacteria are free-living cells that can live inside or outside a body, while viruses are a non-living collection of molecules that need a host to survive.

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explanation:

the oxygenated blood then leaves the lungs through pulmonary veins, which return it to the left heart, completing the pulmonary cycle. this blood then enters the left atrium, which pumps it through the mitral valve into the left ventricle. from the left ventricle, the blood passes through the aortic valve to the aorta.

deoxygenated blood leaves through the right ventricle through the pulmonary artery. from the right atrium, the blood is pumped through the tricuspid valve (or right atrioventricular valve), into the right ventricle.