1. Life has evolved on earth for ~3.8 billion years. Which of
the following options provides the most accurate chronology for the
appearance of important taxa and events over this period?
| a. |
cyanobacteria, prokaryotes, eukaryotes, increase in atmospheric |
|
| b. |
prokaryotes, cyanobacteria, eukaryotes, increase in atmospheric |
|
| c. |
prokaryotes, cyanobacteria, increase in atmospheric oxygen, |
|
| d. |
cyanobacteria, prokaryotes, increase in atmospheric oxygen, |
|
| e. |
prokaryotes, cyanobacteria, eukaryotes, metazoans, increase in |
|
| f. |
cyanobacteria, increase in atmospheric oxygen, prokaryotes, |
|
| g. |
prokaryotes, increase in atmospheric oxygen, cyanobacteria, |





