[Solved] Marcie is 9 months old. If she is like most normal infants her age in terms of physical development, she will be able to: A) walk very well without help. B) build a tower out of two or more building block cubes. C) stand while holding on to a chair or some other support structure. D) stand alone quite well and take a few steps before falling down. Main Effects: The direct impact of an independent variable on a dependent variable in an experiment, ignoring the effects of other variables. Erotic Movies: Films with content designed to sexually arouse the audience, often focusing on sexual desires and fantasies. Non-Erotic Movies: Films that do not contain sexually explicit content. Sexual Arousal: A physiological and psychological state of being awakened to sexual desire and ready for sexual activity.