Examlex
When all three sets of cones are stimulated, a person senses white light.
Geological Eon
A major division of geological time, lasting billions of years, that divides Earth's history into significant phases.
Archean
A geological eon extending from about 4.0 to 2.5 billion years ago, characterized by the formation of the Earth's first stable continental crust.
Hadean
The earliest eon in Earth's history, marked by extreme heat and uninhabitable conditions, spanning from about 4.6 to 4 billion years ago.
Prokaryotes
Microorganisms characterized by the absence of a nucleus, including bacteria and archaea.
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