- The study was unique because the unexpected nature of extreme weather events makes the responses to such events is hard to be studied.
- But Campbell-station stressed on the effects of the natural selection of green anole lizards after the cold weather event that happened during the winter in the southeastern united state.
- He was able to collect data after and before the extreme weather and was able to measure selection at three levels:
1- gene expression.
2- genetic variation.
3- whole animal function.