(1) shark species come in all shapes and sizes. (2) the smallest, the spined pygmy shark, is only 7 inches long. (3) the largest is the whale shark, which can grow to 50 feet long. (4) most sharks are about the same size as an adult person. (5) many are shaped like torpedos, so they can cut easily through the water. (6) others have flat bodies, so they can glide along the ocean bottom. (7) scientists know sharks have existed for a long time because 350-million-year-old shark's teeth have been found. (8) these teeth are extremely hard and fossilize well. (9) as for habitat, sharks live in all the oceans of the world. (10) they also make their homes in some lakes and rivers. 5 in the paragraphs above, which sentence could best be added before sentence 5? (5) many are shaped like torpedos, so they can cut easily through the water. a. sharks gulp down their food without chewing it. b. scientists have proven that sharks are intelligent. c. sharks come in a wide range of shapes. d. the hammerhead shark has a very wide head.