Know the significance of the low/absent levels of oxygen throughout most of the archean era. what were the steps in the transformation from a reducing to an oxidizing atmosphere? what two things did an aerobic metabolism permit in organisms that survived the great oxygenation event?

Which of the following energy sources is not an example of renewable energy? a. a wind turbine farm b. a clean-burning, coal-fired electric plant c. a hydroelectric dam d. a solar panel mounted on a home

What must happen for new french words to be published in official dictionaries? a. they must be approved by the french academy b. they must be voted on by the people of france c. they must be used by famous french writers d. they must be used by philosophers a. they must be approved by the french academy

Which two nations are doing the most to combat their environmental issues?