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Варвара Кошечкина (редактор отдела оперативной информации)
Evolution of new physical traits in mollusks has declined and grown more predictable over time. Early mollusks evolved a unique physical trait once every 2 million years. That frequency began declining roughly 444 million years ago to about one new feature every 9 million years.
· 李娜 · 来源：tutorial资讯