Plants which bear naked seeds are called gymnosperms. Acorns are typical gymnosperm seeds, characterized by their hard, shell. Unlike angiosperms, gymnosperms have no fleshy part to enclose the seed.
Gymnosperms are also one of the oldest forms of plant life to evolve, appearing almost 390 million years ago. There are about 200 species of plants identified as gymnosperms.
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