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