Population density is the number of individuals per unit area.

Explanation:

The population density of an area is a demographic tool used to measure the number of organisms or individuals in a particular area.

 It is expressed as;

    Population density  =  

The unit is expressed as organisms/km²

An area with a high population density is often not desirable as it can lead to pressure on amenities and infrastructure.

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.

that is true   : ) hope this you