Organisms in aquatic ecosystems can be categorized based on their method of mobility in the water. Which of the following would be categorized as benthos? A) ultraplankton because they float and perform photosynthesis B) jellyfish and krill because they float and feed on other organisms
C) turtles and fish because they swim and feed in the large open water
D) crabs and oysters because they move and live along the bottom surface