Why would a study involving continuous handrail support, oxygen uptake, and heart rate in women during submaximal step treadmill exercise be quasi-experimental in design versus experimental? the sample size was small randomization was not used in sample selection the dependent variables were not manipulated the independent variables were not manipulated?

People who exercise for an hour may have lower cholesterol levels. is that a statement? a law? or a hypothesis?

What is the difference between the conducting zone and the respiratory zone of the respiratory system? the conducting zone is a series of cavities and tubes that move air to the respiratory zone where gases exchange with the bloodstream. the conducting zone exchanges gases between the lungs and the alveoli and the respiratory zone is a series of cavities and tubes that move air to the conducting zone. the conducting zone moves oxygen into the cells and the respiratory zone takes carbon dioxide away from the cells. the conducting zone moves oxygen into the bloodstream and the respiratory zone takes carbon dioxide away from the bloodstream.

What is the correct answer for the process of water eroding soil? rills, sheet erosion, gullies sheet erosion, rill, gullies gullies, rills, sheet erosion sheet erosion, gullies, rills