Answer: A - Primitive whales had teeth as adults. baleen whales are believed to have evolved from whales with teeth. The evolutionary process from toothed whales to baleen whales is thought to have taken place over millions of years. Scientists believe that the ancestors of baleen whales were toothed whales that gradually developed baleen plates as a more effective way to filter food from the ocean. The baleen plates, made of keratin (the same material as human hair and nails), replaced the teeth as the primary means of capturing food, and eventually, the whales lost their teeth entirely. Over time, baleen whales became specialized filter feeders, able to consume large quantities of small prey, such as krill and small fish, with their baleen plates.
