Which components make up the cardiovascular system?
lungs, heart, and blood vessels
heart, blood vessels, and blood
heart, blood, and lungs
lungs, heart, and skin

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.