Answer:
Step-by-step explanation:
well look you have two cities and the graph represents the mangrove forest area that they have lost during the years. The gray square is the area of the forests in 2000 and the black square is the area of the forests in 2010.
You can see that over time the forests in both cities have decreased what we can conclude is that city A lost more forest Area over time than city B. Also add the decreasing numbers of both the areas in 2000 and 2010 just to back it up with evidence :)
Hope that helps