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- Do you believe were in a mass extinction period right now? Why or why not?
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- If a sixth extinction event is occurring, how is it similar or different from the previous five mass extinctions? What sort of evidence do you think scientists look for to determine whether we are living through a mass extinction?HOW MANY MASS EXTINCTION EVENTS HAS EARTH WITNESSED SO FAR?What is a mass extinction? What makes the 6th mass extinction that is happening right now different from the last 5?
- Which of the mass extinctions was the largest? What percentage of life went extinct during that time?The best studied of the mass extinctions is the Cretaceous extinction. Why do you think it has been better studied than the other extinctions?We have looked at what the fossil record can tell us about the amazing History of Life on Earth. We've examined the evidence for an early origin for life in the sea, 3800 million years, and investigated how life invaded life about 500 million years. We've also discussed the subsequent boom in life that massively increased biodiversity but also noted how the History of Life is frequently punctuated by mass extinctions. Today we stand on the threshold of a new mass extinction event. The biodiversity that we take for granted and that sustains humans is threatened to a degree only rarely seen in 4500 million years of Earth History. NOW TO CONCLUDE, ANSWER THE QUESTION. 1. ARE WE ON THE BRINK OF A MASS EXTINCTION? WHAT WOULD BE THE CONSEQUENCES FOR SOCIETY OF LOSING HALF OF ALL SPECIES BY 2100? ARE THERE ACTIONS THAT WE CAN TAKE AS INDIVIDUALS AND AS SOCIETY TO HELP PROTECT LIFE ON EARTH?
- Because mass extinction is a natural process that may facilitate evolution during the period of thousands to millions of years that follow it, should humans be concerned about the current mass extinction we are causing? Why or why not?HOW MANY YEARS AGO DID THE MOST RECENT EPOCH BEGIN? HOW MANY MASS EXTINCTION EVENTS HAS EARTH WITNESSED SO FAR?What is the “sixth mass extinction event”?