Earth's first atmosphere contained little or no what

Which would happen if more forests were cut down? a. the nitrogen cycle would be stopped b. nitrogen would be fixed by bacteria more quickly c. the amount of co2 in the atmosphere would increase d. fossil fuels would build up in the soil c the amount of co2 in the atmosphere would increase

Which of the organisms listed below performs nitrogen fixation? a. legumes b. plants c. bacteria d. fungi

All organisms contribute some water to the water cycle by conducting