On the other hand, you could just let them be surprised. You may have a problem in the mold experiments with modern bread. Perhaps someone could bake a single loaf for all the bread people. The hypotheses that your students are starting out with are educated guesses about what will happen, which is fine, you have to start someplace. This is how the loop starts, because in order to test your hypothesis you end up with another experiment which generates another hypothesis and so on.
Cicadas spend the majority of their life as larvae underground feeding on the roots of trees.
These name are deceiving in another way as well. The parents of the ones you see, however, laid eggs 13 or 17 years ago. The most common species we have around here are only 1-year cicadas. That is, . . . Hope this helps.