Which of the following is the best example of an organism with a genetic variation that can improve survival chances in a population over time

An example of what is geese flying south for the

Rotenone is an insecticide that is toxic

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.