The animal and animal cell can be distinguished on the basis of the respective organelles present in them based on their specific functions.
Since the animals do not require energy from the sunlight to synthesis their food which plants do. so animals lack chloroplast. The chloroplast is an organelle present only in the plant cell which captures the energy from the sunlight and use to synthesize the glucose molecule.
For example, On earth you weigh 75kg but on Jupiter you weigh 275kg (not accurate). Your weight has varied. However your mass is the same on both planets.
