nature study a manual for teachers and students nature study soime lower animals 25 backwards and sideways as well as fonvard vast num bers of lobsters and crabs are caught and eaten on the sea coasts mollusks constitute another tvpe of animal life clams oysters and snails all are interesting creatures to study these animals as a rule have a limv shell which is se creted by the skin snails are to be found in ponds and streams on sticks and stones and on water plants some kinds are found on land in gar dens on bark and old logs some snails have a shell fig 06 land sna rdhfk6.jpg from 淄博张店小三调查报告范文tguw567全国调查信息记录均可查 tvpe View Photo