Which of the following is most similar to the functioning of an electron transport chain? a. a person descending a flight of stairs one step at a time. b. a person jumping from the top to the bottom of a flight of stairs in one jump. c. a rock falling from a cliff. d. a person jumping rope.

Which of the following is likely not involved in this example of ecological succession? a) the rotting remains of plants add to the fertility of the soil. b)the soil becomes so fertile that eel grass is replaced by other plant species. c) the roots from plants stabilize the sediment, keeping it in place. d) the concentration of salt becomes so high that all plant life is destroyed.