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Identify the animal group having: 

(a) Body spiny and radial symmetry. 

(b) Bones light and hollow. 

(c) Soft-bodied animals supported by calcareous shells. 

(d) Four pairs of jointed legs, head and thorax fused.

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(a) Echinodermata

(b) Aves 

(c) Mollusc 

(d) Arthropoda

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