![]() Organ System Level – In this, organs become associated to form a functional system where each system is concerned with a specific physiological function. Organ Level – In this, tissues are joined to form organs, and each organ is specialised to perform a particular function. Tissue Level – In this, cells performing the same functions are grouped together to form tissues. Cellular Level – In this, cells are not organised into tissues. They are given below: Level of Organisationĭepending on the organisation of cells, animals are grouped into 2 categories, namely, parazoans (shows cellular level) and eumetazoans (shows tissue level or organ level or organ system level or organisation). Basis of ClassificationĪnimals are classified based on certain common fundamental features. ![]() ![]() Animalia is one of the fundamental groups of living things that includes all animals or all multicellular animals. ![]()
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