Living beings, also  called organisms, have got  basic needs.

 

 

Scientists use some rules to decide if something is a living being. Some of these rules are:

-Living beings are made of cells.
-Living beings obtain and use energy.
-Living beings grow and develop.
-Living beings reproduce.
-Living beings respond to their environment.
-Living beings adapt to their environment.

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The cell is the basic structural and functional unit of all known living organisms. It is the smallest unit of life that is classified as a living thing, and is often called the building block of life.

Organisms can be classified as unicellular (consisting of a single cell; including most bacteria) or multicellular (including plants and animals).​

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Plant cells and animal cells are different.

 

 

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In  organisms, cells are usually specialised. All cells with the same function group together. Such a group of cells is then called a tissue.
 

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