The first outbreak of the evolution of multicellular organisms falls on the Wend, the last period of the Proterozoic (Precambrian), about 620-550 million years ago. At that time, climate of our planet was rather cold, and glaciers that covered the single supercontinent nearly reached the equator. The cold is beneficial for the evolution of sea creatures.
In modern seas, significant concentrations of dissolved oxygen, phosphates, and the organic matter provide for a high biological productivity and the appearance of very large animals. In ancient times, the situation was probably similar: first multicellular organisms lived in cold seawater.
As is known, there was a sharp increase in the fauna diversity in the Cambrian Period. However, in the preceding period, Wend, the fauna was rather rich too, as said Mikhail A. Fedonkin in his report of October 17 in the Vavilov Institute of General Genetics (Moscow). Fedonkin is the corresponding member of the Russian Academy of Sciences and the head of the Laboratory of Precambrian Organisms in the Paleontological Institute in Moscow.
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