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  3. A third fossil formation containing both soft-bodied and hard-bodied animals provides evidence of the result of the Cambrian exp

A third fossil formation containing both soft-bodied and hard-bodied animals provides evidence of the result of the Cambrian exp

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问题     A third fossil formation containing both soft-bodied and hard-bodied animals provides evidence of the result of the Cambrian explosion. This fossil formation, called the Burgess Shale, is in Yoho National Park in the Canadian Rocky Mountains of British Columbia. Shortly after the Cambrian explosion, mud slides rapidly buried thousands of marine animals under conditions that favored fossilization. These fossil beds provide evidence of about 32 modern animal groups, plus about 20 other animal body forms that are so different from any modern animals that they cannot be assigned to any one of the modern groups. These unassignable animals include a large swimming predator called Anomalocaris and a soft-bodied animal called Wiwaxia, which ate detritus or algae. The Burgess Shale formation also has fossils of many extinct representatives of modern animal groups. For example, a well-known Burgess Shale animal called Sidneyia is a representative of a previously unknown group of arthropods(a category of animals that includes insects, spiders, mites, and crabs).
"Sidneyia" is an example of
选项 A、a relative of Anomalocaris and Wiwaxia
B、a previously unknown Burgess Shale animal
C、an extinct member of a currently existing category of animals
D、an animal that cannot be assigned to any modern animal group
答案C
解析
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