The dino-killing asteroid helped set off the ant explosion
Original headline: There Are 15,000 Ant Species on Earth. Blame the Asteroid That Killed the Dinosaurs
What happened
Researchers say ant diversification accelerated around 66 million years ago, after the asteroid impact that wiped out the dinosaurs. They link the boom to retrovirus-like 'jumping genes.' There are now about 15,000 ant species.
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