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