Calculate the density of a solid 500 gram object that displaced 10 ml of water

Calculating density uses the formula D = m ÷ v, where D means density, m means mass and v means volume. So 500/10=50.

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what statement best describes the difference between the sympathetic and parasympathetic nervous systems?

the sympathetic nervous system prepares the body for intense physical activity and is often referred to as the fight-or-flight response. the parasympathetic nervous system has almost the exact opposite effect and relaxes the body and inhibits or slows many high energy functions.