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?

hi there!

question - how does mountainous terrain affect settlements in a region? choose all answers that are correct.

groups trade with each other regularly.

people travel from settlement to settlement.

why: since they travel to go trade or visit it may be harder to get there because of the mountainous terrain.

hope this : )

answer called a epicycle;