Ecosystem  - Cells are the basic unit of life.  All living things are made up of cells connected by electrical current.  A tissue is a group of cells, all of the same kind, and closely connected.   When we have many tissues that are connected to do a similar function, that is called an organ.  When we have many organs that are all connected, we call that an organism.  When we have many organisms connected, we call that an ecosystem.








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