Does animals have a cell membrane?

All living things are made of cells. Some of these cells are plants, others are animals, much less bacteria. Regardless of their origin, each cell contains a cell membrane. The cell membrane is a semi-permeable membrane that surrounds the outside of the cell. Semi-permeability means that some things can get through while other things cannot. Cells are somewhat similar to water balloons. The ball itself represents the cell membrane, and the water inside it represents the inside of the cell.