Name a one-celled organism that  can be found on your skin, in the ground, or in all different types of water.
pathogens
virus
fungus
bacteria
Cells are found in all different types of environments, and these environments are constantly changing. For example, one-celled organisms, like bacteria, can be found on your skin, in the ground, or in all different types of water. Therefore, cells need a way to protect themselves. This job is done by the cell membrane, which is also known as the plasma membrane.