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.
Comparatively, the Legislative Assembly earns the least with an average salary of $33,783. The top two service-type category earners are Agency Heads and Executive Services, with mean incomes of $115,778 and $93,622, respectively. Employees unrepresented by a union earn $44,530 on average.omparatively, the Legislative Assembly earns the least with an average salary of $33,783. The top two service-type category earners are Agency Heads and Executive Services, with mean incomes of $115,778 and $93,622, respectively. Employees unrepresented by a union earn $44,530 on average.