カンブリア紀き

noun

Cambrian period

Geological period from about 541 to 485 million years ago, known for the rapid diversification of life.

• カンブリア紀きには多おおくの生せい物ぶつが爆ばく発はつ的てきに増ふえた。

  During the Cambrian period, many organisms increased explosively.