Official Toefl It Tests Volume 1 Read Online -

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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Five real, formerly administered TOEFL iBT exams. According to paragraph 2, how did increased oxygen

Using official study materials like this book can help you: It enabled the development of larger bodies and

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