Mice and insects are used in scientific experiments because their body systems are so similar to humans. Also, i believe another reason small animals are used for testing is because they will process anything introduced into their body much more quickly, due to faster heart rate and smaller size. Smaller sizes of chemicals would need to be used too, so money and materials can be conserved. Since DNA is so similar in every organism, and is made up of proteins, which can alter external as well as internal physical features, by modifying DNA devolution, or reverse-evolution, is theoretically possible. I believe that it is thought provoking, having DNA similar to a fly's yet being completely different in almost every other way.
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