What stem cell is most useful and is found in the blastocyst stage of the embryo

Eutrophication caused by human nutrient pollution.

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.

Can someone me i need the answer and don’t understand?