1- what country lies south of mongolia? 2- what seas border china? 3- what bodies of water lie between japan and the koreas? 4- if you traveled east along 40n latitude, which east asian countries would you travel through?

The biggest component / ingredient of summer time smog is

According to the federal regulations, which of the following studies meets the definition of research with human subjects? a researcher conducts a comparison of the comments made in a publicly available blog and the blogger's comments on a similar topic in a weekly magazine. undergraduate students in a field methods class are assigned a research question and asked to interview another classmate, to be followed by a class discussion on interview techniques. a cognitive psychologist enrolls undergraduate students for a computer-based study about the effect of mood on problem-solving behaviors. a researcher sets up a meeting with the superintendent of a large and diverse public school system to get data about the ethnic composition of the school system and the number of students receiving free lunches.

Can someone me with these 2 questions? and tell me why it is the correct answer?