OESOPHAGUS STOMACH
ECHINODERMS
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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single shelled mollusk, snails, and whelks
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oysters, clams and scallops
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octopus, squid, and clams
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all of the above
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Detailed explanation-1: -Bivalves are mollusks with two shells such as clams and oysters. Univalves are animals with one shell such as a snail.
Detailed explanation-2: -The terrestrial species include slugs and land snails. Gastropods, such as snails, have a single shell that is often coiled.
Detailed explanation-3: -Gastropods are a highly diverse Class of molluscs that include limpets, whelks, periwinkles, abalones, venomous cone shells, and the shell-less nudibranchs, sea slugs and sea hares.
Detailed explanation-4: -The Class Gastropoda (in Phylum Mollusca) includes the groups pertaining to snails and slugs. The majority of gastropods have a single, usually spirally, coiled shell into which the body can be withdrawn. The shell of these creatures is often what is recovered in a fossil dig.