The organims

The organims there are:

Unicellular:organism with a single cell,Amobea,bacteria and paramoecium 

Multicellular:Organims consisting of many cells:

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Cat

Unicellular and multicellular

The number pf cells in the body varies with different organims.

In some lower forms of life [example:euglena,Amobea]the body is formed of a single cell;these organisms are described as unicellular.

In a unicellular organisms all life activites are carries out by this cell internol structures the intracellular structures