Describe the difference between density and volume

hey there

Density;

The amount of mass or particles per unit of space.

for example, the density of water is 997 kg/m³

Volume;

the amount of space something takes up.

For example Mars is 163 billion cubic kilometers^3

answer; i believe the correct answer is (c) /// is a homogeneous mixture of gaseous substance nitrogen,oxygen and smaller amounts of other substancesmixtures can be either ( homogeneous or heterogeneous)plz check first good luck

answer: they produce more slow than unicellular organisms.