Which behavior is not an example of nonverbal communication

The media influences tobacco use by teens how? a) by showing beautiful, strong, and popular people using tobacco and cigarettes b) tobacco companies describing all the health effects of tobacco use c) cigarette businesses explaining all of the addictive qualities of tobacco use d) none of the above

What is an important step to prove something is valid or not? determining the reliability observing research testing

Explain how unhealthful weight loss or weight gain can lead to further weight loss or weight gain.