1. Pick the "odd one out" (with reference to crustaceans and molluscs).   Oyster   Octopus   Crayfish   Hint Half-n-half Clue   2. _______ animals live on trees.   Aerial   Arboreal   Terrestrial   Half-n-half Clue   3. The larvae of house-flies are known as _______.   caterpillars   pupas   maggots   Half-n-half Clue   4. The nerve carrying messages from the eye to the brain is the _______ nerve.   olfactory   optical   auditory   Half-n-half Clue   5. Pick the "odd one out" (with reference to crustaceans and molluscs).   Shrimp   Mussel   Crab   Half-n-half Clue   6. The nerve carrying messages from the tongue to the brain is the _______ nerve.   gustatory   olfactory   auditory   Half-n-half Clue   7. The nerve carrying messages from the nose to the brain is the _______ nerve.   olfactory   gustatory   auditory   Half-n-half Clue