1. How is living at high altitudes different from living at lower altitudes? no link answers please
put this in your own words please​

Living at high altitudes reduces risk of dying from heart disease low oxygen may spur genes to create blood vessels summary researchers have found that people living at higher altitudes have a lower chance of dying from heart disease and live longer.

The name of the instrument that the scientist uses is called a microscope.a microscope is used to view objects which is not visible to the naked eyes

Carbon dioxide is the correct answer