During chemistry class your teacher challenged you to dissolve four salts as quickly as possible in a specific volume of water. each group had to pick a variable to test, a variable that would speed up the dissolving process. each group had to design an experiment using the steps of the scientific method. the teacher began the experiment with the research question: how can you speed up the dissolution of salt in water. your group stated: if the water temperature increases, the dissolving time of the four salts will decrease. your statement can best be described as your group's a) hypothesis. b) law. c) theory. d) variable.

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.

Q: a: in sexually reproducing animals, once fertilization of the egg takes place, the exists as a single cell until cell division begins

Which of the following is an effect of the uneven heating of the earth by the sun? a sea breeze a land breeze a convection current all of the above