In Darwinian evolutionary theory, does the environment has any role?
To state it clearly:
Suppose I have an isolated system. First, I place several types of entities (organisms) in an environment. According to Darwin, eventually, the fittest will survive.
Next time, I place Only one organism. Will it survive this time as there's no one else in the system? If not, did Darwin also consider the whole environment as another entity, so that in the above case, there are two entities, the organism and the environment. The environment is more evolved and it survives, other dies?
Moreover, if the climate is favourable and the organism reproduces sexually results in the same fate as the case if climate is unfavourable, organism reproduces asexually, what conclusion does it leads to?