Which of the following statements about bilaterian animals is false?a. All bilaterians have bilateral symmetry. b.Many bilaterians are invertebrates but some are not. c.All bilaterians are triploblastic (have three germ layers).d. Most bilaterians have tissues but some do not.

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.