Context: Furthermore, evidence exists that hunting may have been one of the multiple environmental factors leading to extinctions of the holocene megafauna and their replacement by smaller herbivores. North American megafauna extinction was coincidental with the Younger Dryas impact event, possibly making hunting a less critical factor in prehistoric species loss than had been previously thought. However, in other locations such as Australia, humans are thought to have played a very significant role in the extinction of the Australian megafauna that was widespread prior to human occupation.

Question: What does evidence suggest hunting may have been a factor in the extinction of?
Answer: holocene megafauna

Question: What was the North American megafauna extinction coincidental with?
Answer: Younger Dryas impact event

Question: What are humans thought to have played a significant role in, in Australia?
Answer: extinction of the Australian megafauna

Question: When was Australian's megafauna widespread?
Answer: prior to human occupation

Question: What along with multiple environmental factors led to the extinction of the holocene megafauna?
Answer: hunting

Question: What replaced the holocene megafauna?
Answer: smaller herbivores

Question: What event was coincidental with the North American megafauna extinction? 
Answer: Younger Dryas impact event

Question: What is thought to have played a significant role in the extinction of the Australian megafauna?
Answer: humans

Question: What event was Australia's megafauna extinction coincidental with?
Answer: Unanswerable

Question: What did human occupation lead Younger Dryas to be replaced with?
Answer: Unanswerable

Question: What event was megafauna found to be less involved in than previously thought?
Answer: Unanswerable

Question: What was widespread before prehistoric species existed?
Answer: Unanswerable

Question: What event was caused by smaller herbivores in the area?
Answer: Unanswerable