BIOLOGICAL CLASSIFICATION
KINGDOM ANIMALS
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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echinoderms
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Mollusks
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arthropods
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Segemented worms
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Detailed explanation-1: -All molluscs have a specialized foot used in digging, grasping, or creeping. The foot is a muscular organ modified into different forms in different molluscan classes (Fig. 3.53). Molluscs have a mantle or mass of soft flesh that covers the soft body and encloses the internal organs.
Detailed explanation-2: -Soft-bodied invertebrates, mollusks include slugs, snails, octopuses, squid, clams, and mussels. Most mollusks have SHELLS to protect them.
Detailed explanation-3: -mollusk, also spelled mollusc, any soft-bodied invertebrate of the phylum Mollusca, usually wholly or partly enclosed in a calcium carbonate shell secreted by a soft mantle covering the body.
Detailed explanation-4: -bivalves have a large muscular foot that contains longitudinal and transverse muscles as well as a hemocoel (blood cavity). The digging cycle begins with the extension of the foot by contraction of the transverse muscles.