Question

Compare and contrast the movement of echinoderms with fused ossicles and those with separate ossicles. List how they move and how this affects where they live and what they eat. Give at least one example of a species with fused ossicles and one without. (14 points, 2 pts per bullet, 2 pts each example) fused how they move how they move separate ossicles ossicles how they move where they live and what they eat where they live where they live and what they eat Example (species) with separate assicles kample (species) with fused ossicles

Answer 1

Ossicles in echinoderms are small calcareous elements embedded in dermis of body wall .They form part of endoskeleton and provides rigidity and protection.They are found in different arrangements and forms in sea urchin,sea cucumber,sea stars,sea dollars and many other.

So we can divide echinoderms into two groups one having fused ossicles and other having seperate ossicles.Their mode of movement and feeding habit are given below:-

fused Ossicle I how they move with tube feet with spines Both ſo where they are and what they eat olive on ocean Hoor in Shallow or seep water eat Primarily on algae, but also sessile animale live on ocean floor in shallow or deep water. Seperate Thow they move Ossicle By moring water from vaswlar system into tiny feet, they make a foot more by expanding it. where live & what eat I lire un ocean Hour, in shallow or deep water • Gat primarity on molluse but also on oysters, mussels Segurope at bota encike the legample of fused o sea uschin sand dollars ossicle Segample of seperate ossich sea stars brittle stars on e who are