Practice one SAT question at a time
Questions come from the Bluebook question bank. Made by Iskaa303 (Iskander Madikhan).
Global Strontium Seawater Curve 87Sr/86Sr Age (Ma) 0.708980 6.20 0.709000 5.86 0.709020 5.40 0.709040 4.75 0.709060 3.00
The late Hemphillian (Hh) North American Land Mammal Age includes the subdivisions Hh3, 6.8 million years ago (Ma) to 6 Ma, and Hh4, 6 Ma to 4.75 Ma. While mammalian fossils have indicated that Florida’s Montbrook Fossil Site (MFS) and Palmetto Fauna of the Bone Valley Region (PFBV) date to Hh4, a more precise determination of the sites’ ages has proved challenging. Stephanie R. Killingsworth et al. compared average ratios of strontium-87 to strontium-86 (87Sr/86Sr) in fossil shark teeth from MFS and PFBV—0.709000 and 0.709028, respectively—to 87Sr/86Sr ratios in the global strontium seawater curve, a record that shows how 87Sr/86Sr ratios in seawater correspond to numerical ages and that is used to date fossils and, by extension, fossil sites. The researchers concluded that ______blank
Which choice most effectively uses data from the table to complete the statement?
Practice one SAT question at a time
Questions come from the Bluebook question bank. Made by Iskaa303 (Iskander Madikhan).
Global Strontium Seawater Curve 87Sr/86Sr Age (Ma) 0.708980 6.20 0.709000 5.86 0.709020 5.40 0.709040 4.75 0.709060 3.00
The late Hemphillian (Hh) North American Land Mammal Age includes the subdivisions Hh3, 6.8 million years ago (Ma) to 6 Ma, and Hh4, 6 Ma to 4.75 Ma. While mammalian fossils have indicated that Florida’s Montbrook Fossil Site (MFS) and Palmetto Fauna of the Bone Valley Region (PFBV) date to Hh4, a more precise determination of the sites’ ages has proved challenging. Stephanie R. Killingsworth et al. compared average ratios of strontium-87 to strontium-86 (87Sr/86Sr) in fossil shark teeth from MFS and PFBV—0.709000 and 0.709028, respectively—to 87Sr/86Sr ratios in the global strontium seawater curve, a record that shows how 87Sr/86Sr ratios in seawater correspond to numerical ages and that is used to date fossils and, by extension, fossil sites. The researchers concluded that ______blank
Which choice most effectively uses data from the table to complete the statement?