In science, a model is a representation of an idea, an object, a process or a system. Using a plastic bag, students can model the water cycle. ... When the plastic bag is hung in a sunny window, heat from the Sun evaporates water from the lake and forms condensation and precipitation.
Frogs have smooth or slimy skin that is moist, whereas toads have thicker, bumpy skin that is usually dry. All toads are poisonous, while frogs are not.
