Podcast
Questions and Answers
Approximately how long ago did Earth form?
Approximately how long ago did Earth form?
- 4.1 to 4.28 Ga
- 1 trillion years ago
- 3.7 Ga
- 4.5 billion years ago (correct)
When did evidence suggest that life emerged on Earth?
When did evidence suggest that life emerged on Earth?
- 4.1 to 4.28 Ga
- 3.7 Ga (correct)
- 1 trillion years ago
- 4.5 billion years ago
How many species have been identified on Earth?
How many species have been identified on Earth?
- 1 trillion
- 1.75–1.8 million (correct)
- 4.5 billion
- 1.8 million
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?
What is the earliest evidence of life based on?
What is the earliest evidence of life based on?
Which of the following is true about the emergence of life on Earth?
Which of the following is true about the emergence of life on Earth?
What is the estimated number of species that may exist on Earth?
What is the estimated number of species that may exist on Earth?
What percentage of all species that have ever lived on Earth are currently living?
What percentage of all species that have ever lived on Earth are currently living?
What is the approximate age of Earth?
What is the approximate age of Earth?
What is the earliest evidence of life based on?
What is the earliest evidence of life based on?
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