Among the following most complex level of organization is present in:
A
Annelida
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B
Platyhelminthes
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C
Coelenterata
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D
Porifera
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Solution
The correct option is A Annelida
An organ system is a group of organs working together to perform a specific function for the organism.
Organ system level of organization is the hight level of organization among the animals and is exhibited by triploblastic animals such as Annelida, Arthropoda, Mollusca, etc.
Hence the most complex level of organization among the following is present in the phylum Annelida.