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This test is run by .
Note that your final mark will not be saved in the system.

The evolution of Earth's atmosphere MultipleChoice

Running Total

Attempt

1 of 3

Select the correct answer from the list below; answer correctly first time for maximum marks.

Approximately how long ago did algae evolve?

This is your 1^st attempt! You will get 3 marks if you get the answer right. Good luck!

Pass Mark

70%