Life exist in an organised form so as to carry out efficiently the characteristics of living things.
Organisation of life is the existence of life from a single-celled organism to a multicellular organism with complex forms that perform different functions
Four level of organisation exist :-
1. Cell :- some living exist as a cell capable of carrying out all the characteristics of living things. Eg Amoeba Chlamydomonas Paramecium and
Euglena
2. Tissues :- A tissue is a collection of cells which are similar in structure and perform similar functions. Hydra Is an example of animal that is made up of tissues only. examples are blood, epithelial skeletal etc
3. Organ :- An organ is a collection of different tissues that perform a common function or functions. Example of organs are heart, roots, kidney etc
4. System :- A system is a set of organs which co-operate to carry out one vital functions of life. Eg digestive system, reproductive system etc
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