As altitude increases, the available amount of oxygen to sustain mental and physical alertness decreases with the overall air pressure, though the relative percentage of oxygen in air, at about 21%, remains practically unchanged up to 21,000 metres (70,000 ft).
  State legislators in Texas (both representatives and senators) make a salary of $7,200 per year.
The House of Representatives. In the House, representation is based on the number of people living in each state. There are a total of 435 representatives in the House. Each member represents an area of the state, known as a congressional district. The number of representatives is based on the number of districts in a state. Therefore, states with larger populations have more representation than states with smaller populations.