Animal Kingdom
Fundamental basis of classification
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Levels of organisation - It includes cellular level, tissue level, organ level and organ system level of organisation.
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Symmetry - Body of animals can be asymmetrical, radially symmetrical, and bilaterally symmetrical.
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Organisation - Animals are classified on the basis of diploblastic or triploblastic organisation.
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Coelom - Animals can be classified as acoelomate, pseudocoelomate, or coelomate.
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Segmentation - It involves the phenomenon of metamerism.
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Presence or absence of notochord
Phylum - Porifera
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Multicellular organisms with cellular level of organisation
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Water or canal system is present.
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Water enters through ostia and goes out through osculum.
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Skeleton is made of spongin fibres or spicules.
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Choanocytes (colla…
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