Official Toefl It Tests Volume 1 Read Online _verified_ [ PC ]

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What can be inferred about the "Sampling Bias" theory mentioned in paragraph 4? A. It suggests that the Cambrian period did not actually happen. B. It implies that Precambrian life forms were unable to fossilize because they lacked hard parts. C. It argues that Hox genes were present much earlier than previously thought. D. It proves that environmental changes were the sole cause of the explosion.

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According to paragraph 2, how did increased oxygen levels affect evolution? A. It allowed organisms to survive without metabolizing food. B. It caused the extinction of soft-bodied organisms. C. It enabled the development of larger bodies and complex tissues. D. It forced animals to move from the ocean to the land.

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To help you study right now, here is an written to mirror the "deep" academic style and difficulty found in Volume 1 . It suggests that the Cambrian period did not actually happen

Which of the sentences below best expresses the essential information in the highlighted sentence in paragraph 4? (Highlighted sentence: "Therefore, the sudden appearance of fossils might not represent a sudden appearance of life, but rather the sudden appearance of preservable materials.") A. The explosion of life was actually caused by the development of materials that could be preserved as fossils. B. Fossils from the Cambrian period are easier to find because they are made of harder materials than earlier fossils. C. The rapid diversification of life might be an illusion created by the lack of fossil evidence from earlier periods. D. Scientists have discovered that preservable materials appeared suddenly during the Cambrian period.