You are a biomedical engineer involved in a preclinical study aiming at clarifying the mechanisms of right ventricular disease. a fluid-filled balloon is placed in the right ventricle of a mini-pig to replicate severe ventricular dysfunction. the balloon is filled with 30 mg of a contrast solution that makes it visible to fluoroscopic monitoring. as soon as the balloon is deployed, you realize from the pressure reading that there is a leak in the balloon, and the contrast solution is being released into the bloodstream of the animal. you want to continue the study for as long as possible and collect data, but the veterinary surgeon in charge says that it is imperative for the animal's safety to remove the balloon before more than 10 mg of contrast solution are released into the bloodstream.

Juan and carol were studying invertebrates in biology. they knew that segmented or earth worms preferred a dark, moist habitat. during this lab, they would be investigating the responses of organisms called planaria or dugesia tigrina. these were simple flatworms that still had a one-way digestive system and a very simple nervous system. juan and carol placed the planaria in a petri dish containing cool, distilled water that was partially covered with black paper. they shined a light on the dish. next, they removed the paper and placed a small amount of chicken liver at one end of the dish. they added a few large salt crystals to the water. finally, they added drops of hot water to the cool water in the petri dish. their results can be seen in the data table. according to their experiment, all but one conclusion is valid.