Answer:
Don Trine and the boy share the same feelings about the earth
Most of the competition that occurs in our ecosystem is basically just for survival. Breaking down into food supply, shelter, mate, etc. For frogs and birds, the thing that they are competing is the food supply. Given that they could live very near to each other, they will be competing for insects or other smaller animals.
Freedom of choice life in the city
The answer is the readers Senses. Because it helps us better imagine the settings as if we were there.