Select the correct set of characteristics of phylum Echinodermata.

Moderate

A

Body is unsegmented; gills are feather-like; gills have respiratory and excretory functions; usually dioecious and oviparous.
B

All are marine with organ-system level of organisation; they are triploblastic and coelomate; have an endoskeleton of calcareous ossicles.
C

Worm-like marine animals with organ-system level organisation; they are triploblastic and coelomate; body is divided into proboscis, collar and trunk.
D

The body is covered by chitinous exoskeleton; they have jointed appendages; respiratory organs are gills, book gills, book lungs or tracheae.

Solution

Members of Echinodermata are exclusively marine. The endoskeleton is made of calcareous ossicles. They are triploblastic coelomates.
Arthropods have chitinous exoskeleton and jointed appendages. Gills, book gills and trachea are the respiratory structures.
Hemichordates are worm-like exclusively marine organisms. Body divisions include proboscis, collar and trunk.
Unsegmented body with feather-like gills are observed in molluscs.

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