Related terms:
opabinia
cnidaria
fossils
ediacaran
cambrian
body fossils
microbial mat
trace fossils
vertebrates
early cambrian
multicellular
mass extinctions
fossil record
cambrian explosion
debate about whether
extinction event
carbon dioxide
million years ago
Wikipedia sources:
Moon
Paleontology
Lanthanoid
Snowball Earth
Cambrian explosion
Evolutionary history of life
Context for words:
geochemical
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