What adaptation allows the Arctic fox to survive in its environment? A) Short and light fur
B) A small and thin tail
C) A set of very sharp teeth
D) Thick and warm fur

Which statement is a good description of a model? a) models are a description of nature based only on one or two variables. b) models are testable ideas but they are not very to most people. c) models are a description of nature that predicts more accurately than real events. d) models are an approximiation of a real system that omits all but most essential variables in a system.