<span>I believe you are looking for the term, Dichotomous Keying.</span>
I believe B) I think because if there are more animals nothing is going to change but the supplys like food and shelter may decrease but that's not an option
This might be wrong but I think it’s B
<span>This would be fringing reefs. These reef systems grow near to the coastline as well as around islands and large continents. They are generally separated from the shore via shallow lagoons. They are the most common type of reef system on the planet. They are similar to Barrier reefs which also grow parallel to coastlines, but barrier systems are separated by deeper and much wider lagoons.</span>