500
Use the key below to determine the animal that has gills and fins. Then use it to determine which has lungs and nurses it's young.
1. If the animal breathes with gills, go to #2
If the animal breathes with lungs, go to #3
2. If the animal has fins, it is a shark.
If the animal has tentacles, it is an octopus.
3. If the animal has a shell, it is a turtle.
If the animal nurses it's young, it is a whale.
what is a shark? What is a whale?