Absence of head, unsegmented body and endoskeleton of dermal calcareous plate are the characters of

Body is unsegmented and leaf like in

Animals with soft and unsegmented bodies are included in

Select the distinguishable characters of ophiura from balanoglossus (a) Has an endoskeleton of calcareous ossicles (b) Has water vascular system (c) Is radially symmetrical (d) All of the above

Characters of a phylum are given below. Read them carefully and answer the questions : : (a) Spines of calcium carbonate are present on the body. (b) These animals are exclusively marine. (c) They perform the locomotion with the help of tube feet. (d) Their skeleton is made up of calcareous plates or spicules. Animals of which phylum show the above character?

Characters of a phylum are given below. Read them carefully and answer the questions : : (a) Spines of calcium carbonate are present on the body. (b) These animals are exclusively marine. (c) They perform the locomotion with the help of tube feet. (d) Their skeleton is made up of calcareous plates or spicules. Give an example from that phylum.

Internal endoskeleton of starfish is made up of calcareous plates called ossicles. Ossicles are derived from