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General
Specific details:
Absence
Conservation 1
Conservation 2
Death of dinosaurs
Dinosaur extinction 1?
Dinosaur extinction 2?
Early atmosphere
Greenhouse effect
Lack of O2
No oxygen
Origin of life 1
Origin of life 2
Origin of life 3
Origin of life 4
Primitive Earth
Superflares
Thinning 1
Thinning 2