Q. Which of the following marine animals is/are classified under cetaceans' taxonomic groups?

1. Whales
2. Dolphins
3. Porpoises

Select the correct answer using the codes given below:
Answer: 1, 2 & 3
Notes: Cetaceans, a group of marine mammals, include whales, dolphins, and porpoises. These animals are fully aquatic and are characterized by streamlined bodies and a lack of hind limbs. Other major marine mammal groups are pinnipeds (seals, sea lions, walruses), sirenians (manatees, dugongs), and marine fissipeds (polar bears, sea otters).