One of the following is not among the Evil Quartet for accelerated rates of species extinction

The world is facing accelerated rates of species extinction, largely due to human interference. There are four major causes collectively called as the evil quarter- i) Overexploitation, ii) Loss of habitat, iii) Extinction of species, iv) Introduction of exotic species. Thus Co – Existence is not includedin the Evil Quartet for accelerated rates of species extinction.