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Consider the following features: (a) Organ system level of organisation (b) Bilateral symmetry (c) True coelomates with segmentation of body Select the correct option of animal groups which possess all the above characteristics.

1. Annelida, Arthropoda and Chordata
2. Annelida, Arthropoda and Mollusca
3. Arthropoda, Mollusca and Chordata
4. Annelida, Mollusca and Chordata

Correct answer: Annelida, Arthropoda and Chordata

Solution

Annelids, arthropods, and chordates all have organ-system level organization, bilateral symmetry, and a true coelom. They also show segmentation of the body, unlike molluscs, which are not segmented.

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