Explain why entering an interglacial period resulted in an increase in biodiversity on earth.

"It would seem logical that periods of global warming in Earth’s history started the extinction pulses that defined the geological record. However, that’s not the case as a report that was published this week proves. The warming of Earth is accompanied by an increased biodiversity. That doesn’t mean that the mass extinction pulses won’t take place..."
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The process that fuels our sun and allows it to give off that much energy is called nuclear fusion.