Describe the origin of various gymnosperms in the geological time scale
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dear frnds,look in NCERT book on 1st year
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Gymnosperms were the first seed plants to have evolved. The earliest seedlike bodies are found in rocks of the Upper Devonian Series (about 382.7 million to 358.9 million years ago). Hence, it is assumed that the ancestors of seed plants were heterosporous.
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