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| bacteria |
microscopic organisms that often play a role in the decay of living things, the process of fermentation, and sometimes in causing disease. Bacteria are each made up of only one cell, but different kinds of bacteria can take different shapes. These organisms live in all parts of the earth including oceans, deserts, glaciers, hot springs, and in the bodies of most living things. While some kinds of bacteria are dangerous, most kinds are useful because they help in the digestion of food, in the making of soil, in the creation of medicines, and in many other natural processes. |
| germ |
a microscopic organism, especially one that causes illness. Bacteria and viruses that cause diseases are called germs. [1/2 definitions] |
| microscopic |
When something is microscopic, it is very small. It is so small that you can't see it with just your eyes. |
| plankton |
a mixture of very small plants and animals floating in fresh or salt water. Most kinds of plankton are microscopic. Plankton is an important food source for many animals that live in water. |
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