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C
Tissue level organisation - Centipede, Organ level organisation - Earthworm
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D
Tissue level organisation - Earthworm, Organ level organisation - Centipede
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Solution
The correct option is A Tissue level organisation - Hydra, Organ level organisation - Liver fluke Coelentrates are the first animal group to reach the tissue level of organization. Hydra is an example of coelentrate which has tissue level of organization. Figure B.
Liver fluke is an example of Platyhelminthes which has organ level of organization. Flatworms are found in marine, freshwater, and even damp terrestrial environments. Figure C
The others show an organ system level of organization.