A21-day or 60-day "challenge" would likely feature low-impact, strength-building exercises with a focus on flexibility high-intensity cardio, strength-building exercises, and a focus on total body fitness high-intensity, high-energy cardio exercises with little strength-building focus low-intensity, low-impact exercises with a focus on flexibility

Which of the following is a health risk associated with ground-level ozone? a.cataractsb.skin cancerc.respiratory illnessd.all of the above

In which way does nicotine cause addiction? by stimulating the brain’s pleasure center by increasing blood-sugar levels by decreasing dopamine levels by reducing depression and anxiety

Which statement best illustrates that problem solving can create new medical devices? robert hooke was in charge of verifying the information that was sent to the royal academy. william harvey did experiments with apes to learn about the circulatory system. the stethoscope was invented because the physician did not want to put his head on women's chests to listen to their heart and lungs. anton van leeuwenhoek was a very curious man and looked at just about everything under this microscope.