A general trend in global biodiversity is a gradient of: increasing diversity moving from the equator toward the poles. increasing diversity moving out from continental margins to the interior. decreasing diversity moving from the equator toward the poles. decreasing diversity moving from continental margins to the interior.

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.