1. A _______ is a fish.   dove   sardine   frog   lizard   horse   Hint Half-n-half Clue   2. An _______ is an invertebrate.   amoeba   albatross   3. A snake is _______.   a bird   a fish   an amphibian   a reptile   a mammal   Half-n-half Clue   4. A mosquito is _______.   an invertebrate   a vertebrate   5. A toad is _______.   a fish   a reptile   a mammal   an amphibian   a bird   Half-n-half Clue   6. A _______ is a vertebrate.   snake   starfish   7. A _______ is cold-blooded.   polar bear   snake