At an art center in Minneapolis, you can see an American flag with stripes of green and black and black stars on a yellow ground. When you stare at this flag, and then look away, the afterimage is the familiar American stars and stripes in red, white and blue. This complementary afterimage is consistent with which of the following theories of color?a. subtractive color mixing.
b. opponent process theory of color vision.
c. additive color mixing.
d. trichromatic theory of color vision.

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.