Madison is trying to determine which science investigation she should do for the school science fair. She knows that some investigations involve an experiment and that some only involve making observations. Which question is one that she can answer by performing a scientific experiment, instead of only making observations? Which extraction method yields the most DNA from fruit? How did Watson and Crick determine the structure of DNA? Which family members exhibit blue, green, and brown eyes? Which organisms exhibit the most similar physical characteristics?

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.

Where is most of the fresh water on earth found a in the ocean b in glaciers and in ice caps c in rivers d in the soil

Why are lipids and proteins free to move laterally in membranes?