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presentation. Today i´m going to explain a presentation about mollusks . index. Information Bivalves How do they eat Gastropods Cephalopods Mollusks and humans beings A Pearl Questions Videos. MOLLUkC. information.

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  1. presentation Todayi´m going to explain a presentation about mollusks

  2. index • Information • Bivalves • How do theyeat • Gastropods • Cephalopods • Mollusks and humansbeings • A Pearl • Questions • Videos

  3. MOLLUkC

  4. information Any 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.

  5. BIVALVES • 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 identified

  6. HOW DO THEY EAT Bivalves are filterfeeders,thismeansthattheystractnutrientsfromthewater. Mollusks have a rough tonguecalledradula.it’sgotmanytinyteethonit’ssurface. mollusks use theirradulatoscrapefood and break itintosmallerpieces.

  7. gastropods • Manygastropods,likesnails,have got a spiral shell.othergastropods,likeslugs,haven’t got a shell • Gastropods have got a head and body.they’ve also got four tentacles. • Most gastropods are hervivores

  8. cephalopods • Cephalopodshavegot a head with a mouth and well-developedeyes. • They’vealsogotlongarmsto catch theirfood.Somecephalopods,likesquidhavegottentaclestoo. • Mostcephalopods are carnivores

  9. Mollusks and human beings • We use mollusks for a number of purposes. • We can eatsomotypes of mollusks,suchusmussels,clams,oysters,cockles,squid,andoctopuses • We can also use theshells and pearls of oysterstomakejewellery and beautifulobjects

  10. A pearl • Sometimes a smallgrain of sandisbetweentheoyster’sshell and themantle ,theoyster produces a hardshinysubstancecallednacretoprotectitself.Thesandisslowlycoveredwithmanylayers of nacrethateventualyform a pearl.for thisreason ,nacreiscalled ´mother of pearl´

  11. Questions • 1.How do bivalveseat? • 2.what isthename of thesubstance of theoyster? • 3.how do wecallsnail’stongue? • 4.bivalves have a shell? • 5.have gastropods a shell?

  12. answers • 1.they filterthewater • 2. nacre • 3.radula • 4.no theyhaven’t • 5.yes theyhave

  13. videos mollusks

  14. games mollusks

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