From Precambrian Chains to Three Segments

The earliest arthropod bodies undoubtedly formed from wormlike chains of similar tubular segments in Precambrian sediments. So we must first inquire how might a wormy chain of segments have become the plan for the insect bodies we have today.

Imagine a centipede-like body progressively changing perhaps stepwise into a bee's body. A related question might be that if change arises from mutant genes, how were these early bodies able to tolerate large-scale mutations in the genes determining their form without the bodies developing suddenly some grotesque abnormality and becoming dysfunctional enough to end the evolutionary sequence?

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