Horses are pack animals, so they do not like to be alone. They also can live anywhere because they are so quick at adapting to new surroundings.
Because the horses need to be bred to suit their work or their environment
Fish suit their environment because they can breath under water by extracting oxygen through their gills.
no
taking away their food or taking some of the horses
They didnt
No. The Amazon river basin would not be a good environment for horses.
How do some people adapt to better suit their environment?
They eat other animals dung
outside... jk. Maybe out west
You could live in harmony with the environment by changing to suit the place youre in because you can not always change the environment.
Just as with humans animals, including dogs, adapt to their environment by changing the habits/behaviors to suit that environment and optimize their chances of living.
A niche in an horses inviroment is to provide a source of food for predators and to turn up the soil with there hoofs.