Answer:
Animals which have never had terrestrial ancestors are called aquatic animals.
Step-by-step explanation:
Animals classified as aquatics are those that exist in freshwater or saltwater habitats. These creatures have acquired a variety of adaptations that enable them to live and prosper in their aquatic surroundings.
Aquatic animals come in a wide variety of species, including fish, dolphins, whales, crocodiles, and turtles. All across the world, these creatures can be found in lakes, rivers, seas, and other bodies of water.