42. Which of these lives in water permanently? a.Ichthyophis b.Salamander c.Necturus d.Frogs
Amphibians are small vertebrates that need water, or a moist environment, to survive. The species in this group include frogs, toads, salamanders, and ichthyophis. Hyla is a genus of tree frogs belonging to the class amphibia. Balaenoptera (a genus of whales) and flying fox (genus Pteropus) belong to the class mammalia. Ancylostoma is a genus of nematodes that includes some species of hookworms while Nereis is a genus of polychaete worms belonging to annelids.
