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all over the world. Suggested explanations for this include:
* Archosaurs made more rapid progress towards erect limbs than synapsids, and this gave them greater stamina by avoiding Carrier's constraint. An objection to this explanation is that archosaurs became dominant while they still had sprawling or semi-erect limbs, similar to those of Lystrosaurus and other synapsids.
* Archosaurs have more efficient respiratory systems featuring unidirectional

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