Why did he do it?

No.11961485 ViewReplyOriginalReport
We already know that some arthropoda developed the ability to live on land before chordata did. Considering the fact that evolutionary changes are small and the likelihood of a big positive change becomes increasingly small, what pressures could have caused a fish to develop organs suited for survival in air if 1. leaving the water did not diminish the likelihood of you getting predated and 2. the organs were likely not advantageous under water.