what is cell organisms

Solution:

Cells are the basic structural and functional unit of life. They are also known as building blocks of life.

The correct term is cell organelle. 
A group of tissues that perform a specific function or group of functions is called organ. Small organs present within cell are called cell organelles . For example: Mitochondria, endoplasmic reticulum, golgi complex, etc.

Type of cell organelles present in a cell depends on the type of cell whether prokaryotic cell or eukaryotic cells. Prokaryotes show absence of organelles (only ribosomes are found in prokaryotes)​. Eukaryotic cells contain nucleus, mitochondria, plastids, Golgi apparatus, endoplasmic reticulum, ribosomes, centrioles, cytoskeleton, vacoules, lysosomes, etc. 

Unicellular organism- A single cell represents an organism. The entire organism is made up of a single cell. They are said to be single-celled organisms. e.g. Amoeba, Paramecium, Chlamydomonas etc. 
 
Multicellular organism- More than one or many cells combine and coordinate to form a multicellular organism. e.g. humans, plants, insects, snakes, birds, lizards etc.

P.S. Your question was not clear. Hence, I have explained about cells, cell organelles, unicellular (single celled organism) as well as multicellular organisms. In case you had something else in mind, kindly post the clear and correct question again so that our experts can provide you with meaningful help. Looking forward to hearing from you soon. 

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