4. what two sets of units can be used to describe density? why are they interchangeable? a. b. c.

The density of a material is its unique property. Although the density can be expressed in different scale the density of the same material remains same. The reasons for the inter-changeability of the density are-

a. The density of a material is its unique property.

b. The density usually expressed in terms of CGS or SI unit. In CGS unit it is g/mL and in SI unit it is Kg/L.

c. In both the case if we multiply 1000 to gm it becomes kilogram (Kg) and 1000 unit of mL is liter (L). Thus the value remains same.

chemical digestion occurs in the stomach were hcl and pepsin forms chyme, the mouth in which salivary amylase breaks down starch to form bolus, and the small intestine specifically the duodenum.

it is b that is the answer.