Examlex
The active form of vitamin D in the body is ____.
Annelida
A phylum of segmented worms including earthworms, leeches, and their relatives, characterized by a segmented body and often a well-developed coelom.
Echinodermata
A phylum of marine animals characterized by radial symmetry, a calcareous endoskeleton, and a water vascular system, including starfish and sea urchins.
Mollusca
A diverse phylum of invertebrate animals with a soft body, which in many species is protected by a hard shell.
Barnacles
Marine crustaceans with hard protective shells, known for their sessile lifestyle attached to surfaces like rocks, ships, and whale skin.
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