This is what I wrote for my response:
The green frog population decreased after the drought because it no longer held the favorable adaptation. After the plant life around the river died, the green color of the frogs could no longer help them blend into the surrounding environment, thus causing the brown frog population to increase and the green frog population to decrease.
Edg asks for what you included in your response. The details that Edg suggests to be included are:
-After the drought, the remaining environment was mostly brown.
-Having brown coloration was a favorable adaptation because it allowed the frogs to blend in with the surrounding environment.
-The brown frogs were the ones that survived and reproduced, causing the number of brown frogs to increase.
-Having green coloration was an unfavorable adaptation because the frogs were unable to blend in with the surrounding environment.
-The green frogs were less likely to survive and reproduce, causing the number of green frogs to decrease.
Hope this helped! :)
