Cells Page 5
Cells are the basic building blocks of all living things that are plants or animals. Living things are made out of billions of them. A cell can't be seen except when using a microscope. There are many types of cells like skin cells, blood cells, hair cells, stem cells, or nail cells. Cells are composed of many parts but they may differ from each other according to their job. http://www.youtube.com/watch?v=-zafJKbMPA8 Stem cells are mother cells that can be found in the body and have the ability to become any kind of cell. A microscope is a device that helps humans to see tiny things like cells.