Which of the following key adaptations is found in many animals from the Burgess Shale fauna but not found in the Doushantuo and Ediacaran faunas?

Question

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The Burgess Shale fauna is known for the presence of complex mouthparts, such as those found in arthropods, which are not seen in the Doushantuo and Ediacaran faunas. Segmentation and burrow formation are present in all three faunas, while multicellularity is a general characteristic of eukaryotic organisms and is thus present in all of these groups.

Which of the Following Key Adaptations Is Found in Many