Please Use the Following Information to Answer the Question(s) Below

question 16

Multiple Choice

Please use the following information to answer the question(s) below.
Figure 23.1 represents a cross section of the seafloor through a mid-ocean rift valley, with alternating patches of black and white indicating seafloor with reversed magnetic polarities. At the arrow labeled I (the rift valley) , the igneous rock of the seafloor is so young that it can be accurately dated using carbon-14 dating. At the arrow labeled III, however, the igneous rock is about 1 million years old, and potassium-40 dating is typically used to date such rocks. Note: The horizontal arrows indicate the direction of seafloor spreading, away from the rift valley. Figure 23.1
- Figure 23.2
A sediment core is removed from the floor of an inland sea. The sea has been in existence, off and on, throughout the entire time that terrestrial life has existed. Researchers wish to locate and study the terrestrial organisms fossilized in this core. The core is illustrated in Figure 23.2 as a vertical column, with the top of the column representing the most recent strata and the bottom representing the time when land was first colonized by life. Assuming the existence of fossilized markers for each of the following chemicals, what is the sequence in which they should be found in this sediment core, working from ancient sediments to recent sediments?
1) chitin coupled with protein
2) chlorophyll
3) bone
4) cellulose

• A) 2, 4, 3, 1
• B) 2, 4, 1, 3
• C) 4, 2, 1, 3
• D) 4, 2, 3, 1

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