Skeleton made of spongin fibres occurs in [CPMT 2001; RPMT 2001] – McqOptions

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1.	Skeleton made of spongin fibres occurs in [CPMT 2001; RPMT 2001]
A.	Calcarea
B.	Demospongiae
C.	Hexactinellida
D.	Both (a) and (b)
Answer» C. Hexactinellida

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