Which of the following is the correct sequence of events in the origin of life?
I. Formation of protobionts.
II. Synthesis of organic monomers.
III. Synthesis of organic polymers.
IV. Formation of DNA-based genetic systems.
1. | I, II, III, IV | 2. | I, III, II, IV |
3. | II, III, I, IV | 4. | II, III, IV, I |
I: | The earliest organisms that appeared on the earth were non-green and presumably anaerobes. |
II: | The first autotrophic organisms were the chemoautotrophs that never released oxygen. |