<P> The Cambrian explosion or Cambrian radiation was an event approximately 541 million years ago in the Cambrian period when most major animal phyla appeared in the fossil record . It lasted for about 20 -- 25 million years . It resulted in the divergence of most modern metazoan phyla . The event was accompanied by major diversification of other organisms . </P>
<P> The Cambrian explosion or Cambrian radiation was an event approximately 541 million years ago in the Cambrian period when most major animal phyla appeared in the fossil record . It lasted for about 20 -- 25 million years . It resulted in the divergence of most modern metazoan phyla . The event was accompanied by major diversification of other organisms . </P>
what is meant when scientists refer to the cambrian explosion
what is meant when scientists refer to the cambrian explosion
an event approximately 541 million years ago in the Cambrian period when most major animal phyla appeared in the fossil record
an event approximately 541 million years ago in the Cambrian period when most major animal phyla appeared in the fossil record