19. Which of the following is a characteristic of both needlefish and Florida gars? (A) A primitive method of breathing (B) A long, slender body (C) Brightly colored markings (D) A translucent appearance

16. According to the passage, why are Florida gars sometimes concentrated in large numbers? (A) Low water restricts them to certain areas. (B) Swimming in groups protects them from predators. (C) They form large groups to reproduce (D) They migrate from the marshes each year.