There are actually two topics dealt with in this resource. First is the processes by which living organisms maintain homeostasis. Beginning biologists experiment with evaporation to simulate animal perspiration and transpiration in plant leaves. The other topic is the water cycle. Meteorology masters cause miniature clouds to form by condensation and create rain in a water cycle model. Whereas these are educational activities in a well-written lesson plan, you most likely would use them in two completely different courses.