The correct answer is a lizard. The prefix "hydro-" means water, so the hydrosphere means the parts of the earth covered in water, such as oceans, lakes, etc. The prefix "litho-" means stone or rock, so the lithosphere indicates the land on the earth. An animal who lives in both the hydrosphere and lithosphere will likely be an amphibian (such as frogs and lizards), which lives both on land and in water. An eagle is incorrect because it does not live in water. A duck is incorrect because, although it often visits the water, it does not live there (it's a mammal like us). A shark is incorrect because it does not live on land.
