Looking at cells
You can see some cells with your naked eye, such as an unfertilised ostrich egg which is a single cell. But to see most other types of cell, you need a microscope. The more powerful the microscope, the more detail you can see. Some living things, like amoebae, are made of just one cell. A nematode worm is made of exactly 959 cells. You are made of about 100 million million cells, of about 200 different types.
