an ocean is a kind of body of water & a body of water is a kind of environment ->  an ocean is a kind of environment  an ocean is a kind of environment & a tropical environment usually has warm temperatures ->  a tropical ocean usually has warm temperatures  a tropical ocean usually has warm temperatures & coral lives in tropical oceans ->  coral lives in warm oceans  coral lives in warm oceans & coral is a kind of aquatic animal ->  corals are aquatic animals that live in warm oceans  corals are aquatic animals that live in warm oceans & an ocean is a kind of body of water & if fossils of an aquatic animal or plant are found in a place then that place used to be covered by water in the past ->  if fossils of corals are found in a place then that place used to be covered by warm oceans in the past  if fossils of corals are found in a place then that place used to be covered by warm oceans in the past & fossils of corals are found in ohio -> ohio used to be covered in warm oceans in the past