BIOLOGICAL CLASSIFICATION
KINGDOM ANIMALS
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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soft bodies with a thick muscular footmore developed than worms and sponges some have shells breathe with gills or lungs
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jointed legs, segmented bodies, some have wingsHard outer covering called exoskeletonget oxygen through gills or air tubes
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segmented worms
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segmented worms
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Detailed explanation-1: -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.
Detailed explanation-2: -Molluscs have gills in their mantle cavity, which are used for respiration to exchange oxygen and carbon dioxide. Gills are employed by some bivalves for both filter feeding and breathing. Land molluscs have pulmonary sacs or cavities, which are aerial respiration organs.
Detailed explanation-3: -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-4: -A mollusk’s muscular foot is used for locomotion and anchorage, varies in shape and function, and can both extend and retract. The visceral mass inside the mollusk includes digestive, nervous, excretory, reproductive, and respiratory systems.