EARTH ERAS BIO 1202

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Last updated 4:16 AM on 9/18/26
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24 Terms

1
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What are the 8 major events shown on the timeline?
1. Origin of Earth and solar system 2. Prokaryotes 3. Atmospheric oxygen 4. Single-celled eukaryotes 5. Multicellular eukaryotes 6. Animals 7. Colonization of land 8. Present-day humans
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When did the solar system and Earth originate?
About 4.5 billion years ago.
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What are prokaryotes?
Single-celled organisms that lack a nucleus, including bacteria and archaea.
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When did prokaryotes first appear?
About 3.5-4 billion years ago.
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What is atmospheric oxygen?
Oxygen gas that accumulated in Earth's atmosphere, largely due to photosynthetic organisms.
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When did significant atmospheric oxygen begin accumulating?
About 2.4 billion years ago.
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What are eukaryotes?
Organisms whose cells contain a nucleus and other membrane-bound organelles.
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When did single-celled eukaryotes appear?
About 2 billion years ago.
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When did multicellular eukaryotes appear?
About 1 billion years ago.
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What are multicellular eukaryotes?
Organisms made up of many eukaryotic cells working together.
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When did animals first appear?
About 600 million years ago.
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What does colonization of land mean?
The movement of organisms from aquatic environments onto land.
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When did organisms begin colonizing land?
About 470 million years ago.
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When did modern humans appear?
About 200,000-300,000 years ago.
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What is the correct order of the 8 major events?
Origin of Earth → Prokaryotes → Atmospheric oxygen → Single-celled eukaryotes → Multicellular eukaryotes → Animals → Colonization of land → Humans.
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What are the three major eons shown on the timeline?
Hadean, Archean, and Proterozoic.
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What is the Phanerozoic eon?
The eon beginning about 541 million years ago, characterized by abundant visible fossils and complex life.
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What are the three eras of the Phanerozoic?
Paleozoic, Mesozoic, and Cenozoic.
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What is the Hadean eon?
The earliest eon of Earth's history, beginning with Earth's formation about 4.5 billion years ago.
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What is the Archean eon?
The eon during which early life, including prokaryotes, existed and Earth's early crust and atmosphere developed.
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What is the Proterozoic eon?
The eon following the Archean, during which atmospheric oxygen increased and eukaryotic and multicellular life developed.
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What is the Cenozoic era?
The most recent era of the Phanerozoic, including the evolution of mammals and humans.
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What is the Mesozoic era?
The era known for dinosaurs and the diversification of reptiles, birds, and mammals.
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What is the Paleozoic era?
The era during which marine life diversified and plants and animals colonized land.