In the classification of organisms, there are developments with each group. I.e from the simple unicellular organisms to the highly developed multicelluar organisms.
1. The first level of Organisation is CELLULAR LEVEL - A cell is the smallest structural and functional unit of Life. In this level, a single cell may live as an individula enclosed by a cell membrane which protect the cell content.
2. A tissue is a collection of cells which have a similar structure and function. They are a group of specialised cells that stay together to perform a particular function function. Examples of tissues are hydra, muscle tissue, skeleton tissue, or bone, xylem, phloem, epidermis tissue.
3. ORGAN Level: An organ is a group of specialised tissue that work together to perform a specific function.
4. SYSTEM level: a system is a collection of different organs that cordinate or work their activities together to perform a specific function.
5. A whole being. A collection of all the systems make up the whole being.
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