400
Your teacher asks you to write a report about three different animals. You may pick your own, but they cannot be in the same class. Which of the following could you pick and why?
1. koala, panda, manatee
2. bullfrog, alligator, salamander
3. blue jay, ostrich, duck-billed platypus
4. great white shark, sea anemone, zebra
4 - because these animals are a mixture of vertebrates and invertebrates