<unk> <unk> <unk> <unk> <unk>  Passage: In contrast, in 1988, Yellowstone was overdue for a large fire, and, in the exceptionally dry summer, the many smaller "controlled" fires combined. <unk> <unk> <unk> ️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️ Tens of millions of trees and countless plants were killed by the wildfires, and some regions were left looking blackened and dead.<unk> Tens of millions of trees and countless plants were killed by the wildfires, and some regions were left looking blackened and dead. However, more than half of the affected areas were burned by ground fires, which did less damage to hardier tree species.<unk> However, more than half of the affected areas were burned by ground fires, which did less damage to hardier tree species. ️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>  Question: What reestablished themselves quickly after the fire ended?
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