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 barrier to economic development is shown in the following examples?

Many countries in africa have had difficulty creating democratic governments following their independence. all of the following issues have most likely contributed to this problem, except

Ascientist observes hot water erupting from a vent in the earth. what most likely caused the water to rise and erupt from the vent? the vent was lower than the water table. a well was drilled into a pressurized aquifer. a well with a mechanical pump was installed. the water was heated by magma or hot rocks.