Related terms:
raup
sepkoski
muller
geochemical
silurian
ordovician
microbial mat
devonian
fossils
vertebrates
cambrian explosion
paleontology
carboniferous
debate about whether
multicellular
extinction event
fossil record
extinction
evolutionary
carbon dioxide
Wikipedia sources:
Extinction event
Paleontology
Evolutionary history of life
Nemesis (star)
Modern evolutionary synthesis
Context for words:
mass
extinctions
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