What is cell division?

Every living body is composed of cells. Some living bodies are made of only one cell. They are called unicellular organisms, e.g. bacteria, amoeba, plasmodium, some fungi, and some algae, some living bodies are made of more than one cell. 

These are called multicellular organisms. There are many living bodies, which are made of millions of cells. Living bodies like human beings or mango trees etc. are composed of millions of cells. Unicellular organisms increase their number (multiply) by cell division. In this process, one cell divides into two, two to four, and so on.
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