How is Earth's geologic time scale broken down into different periods?(1 point) Responses Based on mass extinction events Based on mass extinction events Based on evolutionary trees and changes in species Based on evolutionary trees and changes in species Based on mummies found in tombs Based on mummies found in tombs Based on when plants/animal fossils are missing
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The Earth's geologic time scale is primarily broken down based on evolutionary trees and changes in species. This classification reflects significant changes in the types of organisms present on Earth and major evolutionary developments, including mass extinction events that led to the emergence of new species. Therefore, the correct response is:
Based on evolutionary trees and changes in species.
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