The FIRST complex multicellular organisms appeared approximately _____ million years ago.
A)50
B)580
C)1800
D)2400

Name: The FIRST complex multicellular organisms appeared approximately _____ million years ago. A)50 B)580 C)1800 D)2400
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The first complex multicellular organisms, known as Ediacarans, appeared approximately 580 million years ago during the late Ediacaran period. Option A is too recent of a timeframe, option C is too early, and option D is not supported by the fossil record.

The FIRST Complex Multicellular Organisms Appeared Approximately _____ Million Years