You've probably seen a lichen, even if you didn't realize it. If you've ever meandered through the forest and wondered what the crusty stuff on trees or rocks was, they're lichens, a combination of algae and fungi living together almost as if they were one organism. And since they can grow on bare rocks, scientists thought that lichens were some of the first organisms to make their way onto land from the water, changing the planet's atmosphere and paving the way for modern plants. A new study in... PHYS.ORG · 4 weeks
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