If the enviroment was harsh. What do you think will survive better the simple or the complex? The answer is obvious.
Of course, it depends on what you mean by "harsh", "complex" and "simple". But taking what I think most would mean the answer is indeed obvious.
It is obvious that the most successful (almost) life forms of the whole planet would succeed. They live today in all the most horribly "harsh" environments on earth. The are the extremophiles of course. It is totally obvious they will survive better than anything.
They are also, by most definitions, very simple. And, as it has always been, the simpler unicellular life will survive.
Edited by Admin, : Fix quote.