increase in available ecological niches increase of atmospheric oxygen to present levels increase in genetic diversity among surviving organisms increase in interbreeding between organisms of different species
I am hesitating between 4 options to answer the following question, which option should I choose?
Question: Which was a main force driving extensive speciation when the environment became hospitable to life after the Permian mass extinction?
Possibilities:
- increase in available ecological niches
- increase of atmospheric oxygen to present levels
- increase in genetic diversity among surviving organisms
- increase in interbreeding between organisms of different species

increase in available ecological niches