The result will usually be that the vinegar cleans the pennies better, demonstrating that a lower-pH solution is better at cleaning discoloration due to oxidation. The volume of liquid and the material of the penny are both controlled variables in this experiment. This experiment is especially good for teaching the concept of a controlled variable if you include a third variable -- how dirty the pennies are.
1 doctor agreed: Yes: Pinworm symptoms can include gastrointestinal upset, anal or vaginal itchiness, loss of appetite, difficulty sleeping, irritability, restlessness. Untreated pinworm infection can lead to weight loss, diarrhea, genital rash, urinary incontinence and vaginal discharge.
These parasites include flat worms, roundworms, hookworms, and flukes. Visitors usually become infected by eating or drinking something that has been contaminated with the parasites' ova, but some of the parasites can also penetrate the skin. Viruses: Rotavirus is the most common cause of severe diarrhea among children.Other viruses include Norwalk, noroviruses (also called Norwalk-like viruses), adenoviruses, calciviruses, cytomegalovirus (CMV) , and HIV.ommon causes of chronic diarrhea: Chronic diarrhea, diarrhea that lasts for more than a few weeks, sporadic diarrhea, and diarrhea that alternates with constipation are most frequently associated with non-infectious causes of diarrhea.