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Questions and Answers
When did Earth form?
When did Earth form?
- 3.7 billion years ago
- 4.28 billion years ago
- 4.1 billion years ago
- 4.5 billion years ago (correct)
How many species have been named and documented in a central database?
How many species have been named and documented in a central database?
- 1.75–1.8 million
- Less than one percent of all species
- 1 trillion
- 1.8 million (correct)
Where were the earliest evidence of life discovered?
Where were the earliest evidence of life discovered?
- Antarctica
- Greenland (correct)
- Sahara Desert
- Western Australia
When were possible 'remains of biotic life' found in rocks?
When were possible 'remains of biotic life' found in rocks?
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What percentage of currently living species represent all species that have ever lived on Earth?
What percentage of currently living species represent all species that have ever lived on Earth?
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Study Notes
Formation of Earth
- Earth formed approximately 4.54 billion years ago
Biodiversity
- Over 1.8 million species have been named and documented in a central database
Earliest Evidence of Life
- The earliest evidence of life was discovered in Western Australia, specifically in the fossilized stromatolites of the Strelley Pool Formation, which date back to around 3.46 billion years ago
Evidence of Ancient Life
- Possible 'remains of biotic life' were found in rocks dating back to around 3.5 billion years ago
Species Extinction
- Only about 1% of all species that have ever lived on Earth are currently alive, implying that around 99% of species that have ever lived on Earth are now extinct
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