Neomyxine biplinicata is an eel-like hagfish. When they sense a treat, they excrete a substance from their pores that turns into a jelly-like fluid when mixed with water. This jelly-like fluid can either trap predators or clog their gills. What two systems alert the hagfish to danger and help produce slime that uses as a defense???(pls help)

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.