Question at position 9  The modern extinction crisis is often referred to as the Sixth Extinction because it resembles past mass extinction events. In what way does the the modern extinction crisis resembles past mass extinction events? Enough species have already gone extinct in the past 500 years to equal that of past extinction events.The current rate of species extinction is approaching past mass extinction rates.The same phylogenetic groups of species are going extinct now as in the past.Mass extinctions occur roughly every 70 million years, and we just happen to be living in one.单项选择题