Question 6 of 10 An independent variable is a factor in an experiment that:
A. is manipulated by the scientist.
B. is deliberately kept the same.
C. responds to the test variable.
D. fails to affect the observations.

Many organizations release indexes used to measure the development of the world's countries. as we learned in this lesson, these indexes measure many factors, from life expectancy to happiness. in your opinion, what are the three most important factors we can use to determine how developed a country might be? explain your answers in a few sentences.