Your respiratory system because your body is working Harder and sweating
The primary way in which the government encouraged settlement in the west was through the Homestead Act, which gave people free land--while the railroads allowed them to travel there safely.
Answer: Islam
Explanation: Most historians believe that Islam originated in Mecca and Medina at the start of the 7th century CE, approximately 600 years after the founding of Christianity. Which was founded in in 1st century AD