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Moss, fern and horsetail are among the oldest land plants on earth. They have existed for millions of years, and even survived the dinosaurs. But what role do they play in the ecosystem? How do they reproduce? And how did these plants manage to survive for so long? Strictly speaking, lichens are neither plants nor animals. But what are they then? And how does a lichen get by without water for up to 40 years? Why don't mosses need roots, and what is special about horsetail? Learn exciting facts about these million-year-old organisms and be amazed.