Which of the following statements is true?

groundwater is not part of the water cycle.
most of the earth's water is freshwater.
refining oil pollutes the air with nitrogen dioxide.
thermal pollution is the main disadvantage of hydroelectric power.

Refining oil pollutes the air with nitrogen dioxide.

Explanation:

The refining of oil such as crude oil like petroleum producing a large amount of toxic gaseous waste in which the nitrogen dioxide is the one. The nitrogen dioxide is a chief pollutant of air. It contributes to the modification and formation of other air pollutants for example, ozone and particulate matter, it also the chief component of acid rain.

answer; i believe that the correct answer is(d) nondisjunction during meiosis;

this protocol provides a detailed procedure for total protein extraction for western blot analysis from achieved samples following trizol isolation of rna.