Question

(1)To which phylum does the star and sea urchin belongs to?
(2)name the substance with which their body is covered.
(3)name the organs of locomotion

Answer 1

Ans 1.Star fish and sea urchin belongs to phylum echinoderms .
Ans 2 .there body is covered in an epidemis or outer skin covering it is internal that is why called endoskeleton. Some echinoderms have tightly interlocking plates ,like sea urchins
ans 3.echinoderms primarily uses their tube feet to move about but some sea urchins also use their spines.

Answer 2

Answer:

1) Phylum - Echinodermata

2) Gills

3) Organ of locomotion is Tube-feet