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| Miller and other chemists showed that organic molecules such as amino acids and urea can only be produced by living organisms |
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| Most scientists classify all living organisms into thre domains: plants, animals, and bacteria. |
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| Which of the following was NOT present in the early atmosphere of earth? |
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| Based on their overall simple structure, viruses are assumed to be the evolutionary precursors of archaebacteria. |
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| Mitochondria appear to have originated via an endosymbiotic relationship between a red algae and a prokaryotic host cell. |
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| Early cells, or their chemical precursors, are thought to have been based on RNA, rather than DNA, in an early "RNA world" |
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| An oxygen-rich atmosphere did not exist on earth until photosynthetic bacteria, such as cyanobacteria, started producing oxygen as a by-product of photosynthesis |
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| Based on similarities of photosynthetic structures and genetic comparisons, multicellular land plants are thought to have evolved from green algae. |
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| Stromatolites are layered structures that result from growth of bacteria that collect sediments and minerals. |
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| Oxygen is thought to have first appeared in large concentrations in earth's atmosphere about 2 billion years ago. Which of the following must have occurred prior to this time? |
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| The evolution of cyanobacteria and other photosynthetic bacteria. |
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| Which of the following makes classification and clarification of evolutionary relationships based on DNA analysis difficult |
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