The correct option is option D.
frog takes up O2 through its skin, while completely submerged all of the frog's respiration takes place through the skin. fish are vertebrates. Reptiles depend entirely on their lungs for respiration, for example desert lizard. respiration in fish and trout takes place with the help of gills. They use the oxygen dissolved in water. bats have lungs for respiration. birds are warm blooded vertebrates. they have pair of lungs for respiration.
Certain terrestrial animals, such as earthworms and amphibians, can breathe through their skins, Most amphibians breathe through both skin and lungs. The frog is an amphibian and vertebrate. So, the answer is D.