Describe the conditions on Earth that made life possible for different types of organisms.

The beginning of life on Earth is characterized by a favorable suite of conditions. As the climate and environment changed, so did the types of organisms that developed. Describe the conditions on Earth that made life possible for different types of organisms. Think about geologic and evolutionary time scales in terms of how long it took for different organisms to development and become successful. Relate the history of life on Earth to how the climate and environment is changing today, especially in terms of rate of change.