Gastropods (snails and slugs)

Evolution 

•    minerals in the bodies of gastropods are like those in the 31 ………………

•    fossils date back 500 million years

Physical features 

•    single, muscular foot 
•    radula (used for feeding)
•    Shell (snails only)
•    size: British shells range from 1.5-50 mm
•    form: most shells coil to the 32 ..................
•    some shells have ribs, spines or 33 .................
•    they have various colours and patterns

Feeding habits
     •    mainly feed on rotting plants, fungi or algae
     •    some eat live animals, e.g. shield slugs eat 34 .............
Predators
•    birds, frogs, flies
•    humans - snails were probably introduced to Britain as food in the 35 ................
•    many gastropods have particular types of 36 ................. itself slippery, e.g. glutinous snail makes
Habitats
  •    gastropods prefer dampness and shade
•    37 ............. conditions are worst
•    biggest variety is found in old, natural habitats, e.g. 38 ............... and meadowland
•    highly specialised species live in unusual habitats, e.g. blind snails lives entirely below the 39 .............
•    good indicators of the quality of the 40 ................