28. List three things about whales that tell scientists that they are not fish.

Whales are warm blooded, which means they keep a high body temperature that doesn't change in the colder waters. Fish are cold-blooded, so their body temp changes depending on the temperature of their environment. Whales breathe air with lungs using their blowholes!

1 they don't eat plant, they eat plankton

2 they are mammals

3 they have blowhole like other aquatic mammals