Place in chronological order the following steps in the formation and evolution of Earth's atmosphere. a. Plant life converts CO2CO2 to oxygen. b. Hydrogen and helium are lost from the atmosphere. c. Volcanoes, comets, and asteroids increase the inventory of volatile matter. d. Hydrogen and helium are captured from the protoplanetary disk. e. Oxygen enables the growth of new life-forms. f. Life releases CO2CO2 from the subsurface into the atmosphere.
