1996, to reduce STDs and unwanted pregnancies
Yes so they wouldn’t have to spend anymore money
Answer: Nitrogen oxides are present in combustion and industrial processes.
Explanation: We are talking about the combustion of coal, oil and gasoline by the emission of vehicles such as ships, airplanes trucks and automobiles, which is specially significant in big cities where there is more traffic . For the industry part there are the electric power plants and large industrial operation plants.
If the result of a study can be generalized to other subject population, it is said to have an External Validity. Validity, in scientific research, refers to the approximate truth of the results or conclusion of your research. Thus, external validity being always related to generalization, is the approximate truth of the conclusion of a research that applies to other people, places, and time.