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Echinoderms are heartless, brainless and headless yet from evolutionary point of view, they have been placed on the top of the invertebrate phyla because of the presence in them of
Echinoderms are heartless, brainless and headless yet from evolutionary point of view, they have been placed on the top of the invertebrate phyla because of the presence in them of
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Solution
The correct option is D Presence of enterocoel
Echinoderms are the "wonders of the Sea" and are not found on the land or fresh water. Many echinoderms have a radial symmetry and a spiny skin. The coelomic cavity in echinoderms are complex, formed by the fusion of coelomic sacs and are developed from the wall of the archenteron- the rudimentary alimentary cavity is known as the enterocoel. This network of the fluid-filled canals makes up a unique water vascular system. The radial symmetry, spiny calcareous skin and presence of enterocoel gives them the evolutionary significance.
Echinoderms are the "wonders of the Sea" and are not found on the land or fresh water. Many echinoderms have a radial symmetry and a spiny skin. The coelomic cavity in echinoderms are complex, formed by the fusion of coelomic sacs and are developed from the wall of the archenteron- the rudimentary alimentary cavity is known as the enterocoel. This network of the fluid-filled canals makes up a unique water vascular system. The radial symmetry, spiny calcareous skin and presence of enterocoel gives them the evolutionary significance.
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