After Retrieving a Core,the Layers May Be Analyzed in Two

question 24

Multiple Choice

After retrieving a core,the layers may be analyzed in two ways.First,scientists study the presence or absence and fluctuations of different foraminiferan species.Second,using a mass spectrometer,they analyze the

• A)fluctuations in the ratio of stable oxygen isotopes 18 and 16 in the calcium carbonate of the foraminiferan shells
• B)fluctuations in the ratio of nitrogen isotopes 15 and 14 in the calcium carbonate of the foraminiferan shells
• C)fluctuations in the ratio of pollens to foraminifera through time
• D)fluctuations in the amino acids of bone collagen in the foraminifera
• E)all of the above

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The phenomena of the physical world collectively, including plants, animals, landscapes, and other features and products of the earth, as opposed to humans or human creations.

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