MOLLUSC

presentationToday im going to explain a presentation about mollusks InformationBivalvesHow do they eatGastropodsCephalopodsMollusks and humans beingsA PearlQuestionsVideos

indexinformationAny of some 75,000 species of soft-bodied invertebrate animals (phylum Mollusca), many of which are wholly or partly enclosed in a calcium carbonate shell secreted by the mantle, a soft covering formed from the body wall. Bivalves (Bivalvia) are a group of molluscs that include clams, scallops, oysters, mussels, razor shells, cockles, venus shells, borers, trough shells and many others (some of which have yet to be identifiedBIVALVES

Bivalves are filter feeders,this means that they stract nutrients from the water.Mollusks have a rough tongue called radula.its gotmany tiny teeth on its surface. mollusks use their radula to scrape food and break it into smaller pieces.

HOW DO THEY EATMany gastropods,like snails,have got a spiral shell.other gastropods,like slugs,havent got a shellGastropods have got a head and body.theyve also got four tentacles.Most gastropods are hervivoresgastropods

Cephalopods have got a head with a mouth and well-developed eyes.Theyve also got long arms to catch their food.Some cephalopods,like squid have got tentacles too.Most cephalopods are carnivores

cephalopods

We use mollusks for a number of purposes.We can eat somo types of mollusks,such us mussels,clams,oysters,cockles,squid,and octopuses We can also use the shells and pearls of oysters to make jewellery and beautiful objects

Mollusks and human beingsSometimes a small grain of sand is between the oysters shell and the mantle ,the oyster produces a hard shiny substance called nacre to protect itself.The sand is slowly covered with many layers of nacre that eventualy form a pearl.for this reason ,nacre is called mother of pearlA pearl 1.How do bivalves eat?2.what is the name of the substance of the oyster?3.how do we call snails tongue?4.bivalves have a shell?5.have gastropods a shell?Questions 111.they filter the water2. nacre3.radula4.no they havent5.yes they haveanswersvideosmollusksgamesmollusksYou're Nobody 'Til Somebody Loves YouJames ArthurYou're Nobody 'Til Somebody Loves You, track 12013Pop201964.55eng - RnBXclusive.se