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Savatey [412]
3 years ago
9

The Tapeats Sandstone and Bright Angel Shale contain fossils of trilobites. Trilobites were marine organisms similar to modern-d

ay horseshoe crabs. No other layers contain trilobite fossils. Which conclusion best explains these observations?
A. The area became dry land after the Bright Angel Shale period.
B. An asteroid hit the earth after the Bright Angel Shale period.
C. The trilobites became extinct after the Bright Angel Shale period.
D. The trilobites migrated away from the area after the Bright Angel Shale period.
Chemistry
1 answer:
Anna007 [38]3 years ago
3 0
<span>D. The trilobites migrated away from the area after the Bright Angel Shale period.</span>
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The ostwald process is used commercially to produce nitric acid, which is, in turn, used in many modern chemical processes. in t
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The complete balanced chemical equation is: 
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From the balanced equation: 
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