TRUE.THEY DO NOT COTAIN THOSE THINGS.
PH meter, which is a device used to measure hydrogen-ion activity in the solution. A PH meter is a voltmeter stuck to a pH electrode and a reference electrode. -maclittleseed
We breathe in air, not straight oxygen. Attached is a pie chart showing roughly what percentage of what is in the air we breathe
Land use is when an area is used for a specific purpose. There are five types of land use: residential, agricultural, recreation, transportation, and commercial.