premise: traits that help animals survive in a certain kind of environment are often found in animals in that environment sent2: keeping warm is the opposite of becoming cold sent3: if a living thing becomes too cold then that living thing will die sent4: layers of fat are used to keep animals warm sent5: blubber is a kind of fat sent6: if the environmental temperature / air temperature is too cold then an animal / a living thing in that environment may become cold sent7: cold environments have cold temperatures / weather sent8: climate is the average weather / temperature in an area sent9: an animal is a kind of living thing.
hypothesis: sound can reflect off the canyon wall and produce an echo