Cellular level of organisation - There is only one cells or a loose aggregate of cells that work independently, without any coordination

Example - Amoeba, Paramoecium

Tissue level or organisation - A group of cells that are structurally/ functionally similar work together to perform a common function

Example - Nervous tissue, Epithelial tissue 

Organ level of organisation - One or more tissues work together to achieve the functions of the organ

Example - heart, lungs

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Maninder Singh's photo - Co-founder, Teachoo

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Maninder Singh

CA Maninder Singh is a Chartered Accountant for the past 14 years and a teacher from the past 18 years. He teaches Science, Economics, Accounting and English at Teachoo