Answer :
Final answer:
Echinoderms' habitat, characteristics, and presence of mantle cavity in the phylum Echinodermata.
Explanation:
Echinoderms are marine organisms found in the ocean from the equator to the poles. They exhibit pentaradial symmetry and have a water vascular system for various functions. Examples include sea stars, sand dollars, and feather stars.
Echinoderms inhabit coastal regions and deep-sea regions. They can be commonly seen in shallow waters near the shore, while some, like feather stars, live in the deep ocean.
The presence of a mantle and mantle cavity is a characteristic feature of the phylum Echinodermata, distinguishing it from other phyla like Mollusca and Nemertea.
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