A highly addictive drug that is found in all Tobaco products

The famous scientist galileo galilei did several experiments with sloping planes, which he rolled metal balls down so that he could study motion. by changing the slope, he could study how the speed at which the ball rolled was affected. what was the dependent variable in galileo's experiment?

Which is not an effect of aging? secondary sex characteristics appear bones shrink and become more brittle skin becomes drier and less elastic hearing and vision become less sharp

Which of these following is necessary to resolve conflict