Which ecosystem has been least changed by humans -forest, grasslands, or desserts? why do you think so

Which of the following terms describes the layers of air surrounding the earth ?

All of the following actions are examples of civil disobedience, except a.) refusing to pay an unfair tax b.) refusing to use government services c.) participating in a protest march d.)planning a riot to destroy a government riot

All of the following occurred due to the invention of the railroad except