Why cambrian explosion happened

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Unanswered Questions The sudden change of the Cambrian Era was, in relative terms, not too sudden for the process of evolution. Iten eds. Eerdmans Pub. Darrel R. Brennan, T. Lowenstein, and J. Lipps and P. Signor eds. Narbbonne, M. Laflamme, C. Greentree, and P. Erwin and Eric H. Peterson et al. Hoffman and D. Fike, J. Grotzinger, L. Pratt, and R. Shu, D-G. What is BioLogos?

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Next up: the White Sea biota, which included mobile creatures such as Dickinsonia —a ribbed oval that was recently confirmed as an animal. Then the Nama biota—a so-called wormworld that ushered in tubular animals, including some with hard shells. When the Cambrian fauna eventually arrived, Wood thinks it appeared in two pulses. That makes at least five distinct bursts of diversification that straddle the divide between the periods.

Did only a few Ediacaran lineages survive the transition to the Cambrian, or did many of them do so? Lidya Tarhan from Yale University is more convinced. Others have argued that the Cambrian explosion was sparked by a rise in oxygen , which fueled the evolution of active behaviors and larger, gas-guzzling bodies.

Instead, for much of the Ediacaran, levels of the vital gas fluctuated over time, and across different layers of the oceans.