premise: keeping warm is the opposite of becoming cold sent2: if the environmental temperature is too cold then an animal in that environment may become cold sent3: thick fur can be used for keeping warm sent4: a rabbit is a kind of animal sent5: an animal is a kind of living thing sent6: when fur grows it becomes thicker sent7: winter has cold temperatures sent8: if a living thing becomes too cold then that living thing will die.
hypothesis: a metal nail will most likely be attracted to a magnet