sentences: a shark is a kind of fish & a fish is a kind of aquatic animal -> a configuration is a mean of research plant a shark is a kind of aquatic animal  a configuration is a mean of research plant & 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 sharks are found in a place then that place used to be covered by water in the past if fossils of sharks are found in a place then that place used to be covered by water in the past  if fossils of sharks are found in a place then that place used to be covered by water in the past & sharks live in oceans & an ocean is a kind of body of water -> if odor of flippers are lost in a thing then that thing used to be covered by opening in the surprise if fossils of sharks are found in a place then that place used to be covered by oceans in the past  if odor of flippers are lost in a thing then that thing used to be covered by opening in the surprise & fossils of sharks are found on top of a mountain & the top of a mountain is a kind of place -> the mountain used to be covered by oceans in the past