TOEFL Listening: TPO-TOEFL阅读TPO - 9I04ZIG1FPXQRC8VN$

Why does the author mention "Anomalocaris" and "Wiwaxia"? A. To contrast predators with animals that eat plants such as algae B. To question the effects of rapid mud slides on fossilization C. To suggest that much is still unknown about animals found in the Burgess Shale D. To provide examples of fossils that cannot be assigned to a modern animal group