Hurrah, we come to the end of the module! We talked about why whales are not considered as fish by scientists.A fish is cold-blooded, and lays eggs. Whales are warm-blooded and give birth to their young ones directly. So, whales belong to the Mammalia group, not the Pisces group.Because humans also belong to the Mammalia group, whales are closer to humans than to fish.
Check out the next module in this series! Motion 1