Which of the following statements is true?

snuff does not contain actual tobacco, but it is considered a form of tobacco use.

substance abuse problems are more likely to stem from the use of drugs than from drinking alcohol.

good physical health requires at least 30 minutes of aerobic exercise each day.

certain sexual behaviors are risky and can result in negative consequences.

Aresearcher lyses a cell that contains nucleic acid molecules and capsomeres of tobacco mosaic virus (tmv). the cell contents are left in a covered test tube overnight. the next day this mixture is sprayed on tobacco plants. we expect that the plants would ) develop some but not all of the symptoms of the tmv infectionb) develop the typical symptoms of tmv infectionc) not show any disease symptomsd) become infected, but the sap from these plants would be unable to infect other plants