Bordetella pertussis causes whooping cough by
a) irritating the diaphragm, which leads to severe coughing attacks.
b) forming a pseudomembrane that obstructs the respiratory passages.
c) interfering with the activity of ciliated epithelial cells in the trachea.
d) suppressing mucus production.
e) the development of pneumonia.

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.