The height of a stack of 5 pennies is 0.72 cm and the radius of the stack is 0.91 cm. the volume in ml of this stack of 5 pennies

pure substance: iron,copper

impure substance: water,charcoal

specific gravity is the density of a substance divided by the density of water. since (at standard temperature and pressure) water has a density of 1 gram/cm3, and since all of the units cancel, specific gravity is usually very close to the same value as density

so "c" is the answer

plz give brainliest