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
Which was a main force driving extensive speciation when the environment became hospitable to life after the Permian mass extinction?

Options:
- 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