A. Grass is eaten by a wren. The wren is eaten by a hawk. The hawk is eaten by a snake.
B. Grass is eaten by a wren. The wren is eaten by a snake. The snake is eaten by a blue jay.
C. Grass is eaten by a grasshopper. The grasshopper is eaten by a snake. The snake is eaten by a blue jay.
D. Grass is eaten by a grasshopper. The grasshopper is eaten by a blue jay. The blue Jay is eaten by a hawk.