7. Which option places the likely events in the origin of life in the correct order? Answers A. Abiotic synthesis of amino acids and other organic molecules / synthesis of proteins / development of a genetic code / evolution of cells B. Abiotic synthesis of amino acids and other organic molecules / synthesis of proteins / evolution of cells / development of a genetic code C. Synthesis of proteins / abiotic synthesis of amino acids and other organic molecules / development of a genetic code / evolution of cells D. Abiotic synthesis of amino acids and other organic molecules / development of a genetic code / synthesis of proteins / evolution of cells 9. Banded red rock formations dating from about 1.8 billion years ago were formed from oxygen reacting with free iron ions. Eventually, these rocks were no longer being formed, and the oxygen began to accumulate in the atmosphere. Integrate this information and your knowledge of conditions on early Earth. What logical conclusions can you draw? Answers A. Oxygen could not accumulate in the atmosphere until most of the free iron ions were used up. B. Oxygen had to have been present in the atmosphere before 1.8 billion years ago. C. Oxygen can be released by banded iron formations. D. Early life could not evolve before oxygen was present to sustain it. 25. How does the fossil Australopithecus called "Lucy" contribute to our understanding of hominin evolution? Answers A. This fossil indicates that large brains evolved before bipedalism. B. This fossil supports the hypothesis that large brains evolved while our ancestors were still arboreal. C. This fossil supports the hypothesis that early hominins lived on the savanna. D. This fossil indicates that bipedalism evolved before large brains.
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