Answer all of the following questions: Describe how life changed over the course

Answer all of the following questions:
Describe how life changed over the course of Earth’s history. What happened in each of the geologic eras? Describe mechanisms that caused Earth’s climate to change in the past. Compare these mechanisms to how climate is changing today. What are the social and political impacts of climate change today?
Describe how the thermohaline circulation functions. Provide specific details/examples.