Fossil Record
The lack of hard parts in Soft-bodied organisms makes them extremely rare in the fossil record. Accordingly, the evolutionary history of many of the soft-bodied groups are poorly known. The first major find of fossil soft-bodied animals was from the Burgess Shale in Canada. Today, several Burgess shale type faunas are known, but the history of many groups of soft-bodied animals is still poorly understood.
Read more about this topic: Soft-bodied Organisms
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