True or False:
1.) A scientific theory is an idea supported by research that attempts to explain existing observations or predict new ones.
2.) A cross-sectional research study analyzes the same group of subjects over a long period of time.

*#3 is not true or false*
3.) Which of the following statements about extraneous variables is not accurate?
A. An extraneous variable can also be a confounding variable.
B. An extraneous variable clarifies the relationship between the independent and dependent variables.
C. An extraneous variable can alter the results of an experiment in an undesired way.
D. An extraneous variable cannot be the same as an independent variable.