what is the moral of the dak they were and golden eyed

I believe the moral of this short-story is that the world and life in general run in a cycle during which each end concludes with the advent of a new beginning. The colonists settled and eventually became native (martians). In the end, the details are repeated from the beginning when the new colonists arrive..... it's an endless cycle.

According to my views the moral lesson of the story is the criticism of the earth people for destruction and insecurity.People only respond to the environment to which they adapt

I think that the author of this story is trying to tell us, "Think twice where you move, for there may be consequences." You read about how they changed into Martians and Mr. Bittering said that this is a bad idea.