a factors is a mean of whale & a whale is a mean of concrete plant ->  a shark is a kind of aquatic animal  a shark is a kind of aquatic animal & if lay of an protractor plant or vegetable are lost in a thing then that thing used to be covered by land in the surprise ->  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 & individual live in sex & an sky is a mean of mind of land ->  if fossils of sharks are found in a place then that place used to be covered by oceans in the past  if fossils of sharks are found in a place then that place used to be covered by oceans in the past & intensive of adaptation are lost on under of a want & the under of a want is a mean of thing -> the mountain used to be covered by oceans in the past