History of Life on Earth

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What is relative dating?

Back

Relative dating is a method used to determine the age of fossils by comparing their placement in layers of rock to other fossils.

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What are periods in the context of geological time?

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Periods are subdivisions of eras in the geological time scale, used to categorize the history of life on Earth.

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What is a fossil?

Back

A fossil is a trace or imprint of a living organism that has been preserved in rock.

Front

Can the fossil record help scientists identify when different species lived and died?

Back

True, the fossil record provides evidence of the existence and extinction of species over time.

Front

What is the fossil record?

Back

The fossil record is the collection of all known fossils, which are found in sedimentary rock, providing insights into the history of life.

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What is absolute dating?

Back

Absolute dating is a method used to determine the exact age of a fossil or rock, often using radiometric techniques.

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What are eons?

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Eons are the largest divisions of geological time, which are further divided into eras.

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What is natural selection?

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Natural selection is the process by which organisms better adapted to their environment tend to survive and produce more offspring.

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What are homologous structures?

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Homologous structures are body parts in different species that have a similar structure but may serve different functions, indicating a common ancestor.

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Who was Charles Darwin?

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Charles Darwin was a naturalist who proposed the theory of evolution by natural selection, explaining how species change over time.