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?

Name: 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?
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The Burgess Shale fauna, which is from the Cambrian period, includes animals with more complex features such as specialized mouthparts, which are not found in the earlier Doushantuo and Ediacaran faunas.

Which of the Following Key Adaptations Is Found in Many