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Compact genomes and tiny cells gave flowering plants an edge over competing flora. This discovery hints at a broader evolutionary principle.
Studies of the energy-harvesting proteins in primitive cells suggest that key features of photosynthesis might have evolved a billion years earlier than scientists thought.
A definitive explanation for why plants evolved spines remains elusive, and human biases compound the problem.
Striking evidence that plants warn each other of environmental dangers is reviving a once ridiculed field.