What was unique about the study conducted by campbell-staton?

- 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.