1. A snake is _______.   a bird   a mammal   an amphibian   a reptile   a fish   Hint Half-n-half Clue   2. A _______ is a vertebrate.   starfish   snake   3. A spider is _______.   a vertebrate   an invertebrate   4. A _______ is cold-blooded.   snake   polar bear   5. A mosquito is _______.   an invertebrate   a vertebrate   6. A whale is _______.   an amphibian   a mammal   a reptile   a bird   a fish   Half-n-half Clue   7. A _______ is a vertebrate.   herring   jellyfish