During an experiment what factor is observed and measured?
a. dependent variables
b. independent variable
c. constants
d. hypotheses

How have high taxes on tobacco products impacted the number of people who use them? a. the number of tobacco users has increased. b. the number of tobacco users has decreased. c. the number of tobacco users has not changed. d. the number of adolescent tobacco users decreased, while the number of adult users increased

Phosgene is a chemical agent that is formed by decomposition of chlorinated hydrocarbon solvents by ultraviolet radiation. a. false b. true

When ash and dust begin to settle on the ground, they eventually become compacted by