If you found a fossil from the 2.5 billion years ago, it would have been a shelled organism.

Name: If you found a fossil from the 2.5 billion years ago, it would have been a shelled organism.
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The first shelled organisms did not appear until around 542 million years ago during the Cambrian Period. Therefore, if you found a fossil from 2.5 billion years ago, it would not have been a shelled organism.

If You Found a Fossil from the 2