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Journey Through Time

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Questions and Answers

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?

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?

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?

Less than one percent Signup and view all the answers

What is the earliest evidence of life based on?

Biogenic carbon signatures and stromatolite Signup and view all the answers

Which of the following is true about the emergence of life on Earth?

Life emerged after 3.7 Ga Signup and view all the answers

What is the estimated number of species that may exist on Earth?

1 trillion Signup and view all the answers

What percentage of all species that have ever lived on Earth are currently living?

Less than one percent Signup and view all the answers

What is the approximate age of Earth?

4.5 billion years Signup and view all the answers

What is the earliest evidence of life based on?

Biogenic carbon signatures and stromatolite Signup and view all the answers

Journey Through Time

Choose a study mode

Podcast

Questions and Answers

Approximately how long ago did Earth form?

When did evidence suggest that life emerged on Earth?

How many species have been identified 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?

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 percentage of all species that have ever lived on Earth are currently living?

What is the approximate age of Earth?

What is the earliest evidence of life based on?

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