Some germs rely on insect carriers – such as mosquitoes, fleas, lice or ticks – to move from host to host. These carriers are known as
vectors
virus
bacterium
O meningitis

vectors

I hope i'm correct but according to the given choices none of it is correct besides vectors.

the maintenance of fluid balance during exercise. author information: fluid supplementation is necessary for exercise in which fluid losses must be offset by intake to avoid the negative effects of hypohydration on health and performance.

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