the autonomic nervous system, which controls vital functions such as breathing, digestion, heart rate, and secretion of hormones. Skull The purpose of the bony skull is to protect the brain from injury. The skull is formed from 8 bones that fuse together along suture lines. These bones include the
Density is a measurement of how solid something is. Specifically it is the mass per unit volume of a substance. If you have two objects of the exact same size (volume), the more dense object will weigh more than the less dense object. So there are two things contributing to density:
Density just means how much mass is their. Like how much water is in a glass. The mass density or density of a material is its mass per unit volume. The symbol most often used for density is Ï (the lower case Greek letter rho).he mass per unit volume of a substance under specified conditions of pressure and temperature. Computer Science The number of units of useful information contained within a linear dimension. The number of individuals, such as inhabitants or housing units, per unit of area.