The half life of 14 c is 5730 years if a sample

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126.The half-life of 14C is 5730 years. If a sample contained 100% 14C and 0% 14N at a point in time 17,190 years ago, then what percentage of 14C would it contain today?A)12.5%B)25%C)50%D)75%E)100%
127.The half-life of 14C is 5730 years. Archaeologists dig up a seed that contains 0.25 parts per trillion 14C. If it originally contained 1 part per trillion 14C, how old is the archaeological specimen?
128.Which of the following radioisotopes could be used to accurately date a fossil that is thought to be over 750 million years old?
U
U129.Which of the following statements about Archaeopteryxis FALSE?
130.The discovery of Tiktaalik roseaewas significant for which of the following reasons?It provided evidence that terrestrial
A)It provided evidence that terrestrial vertebrates are descended from fish.B)It provided evidence that birds and dinosaurs are closely related.C)It was the first fossil to be found with soft parts preserved.D)It provided evidence that the continents were once linked together.It was the first fossil from which DNA and other macromolecules were successfully extracted.
E)131.Dinosaurs disappeared at the end of which period?
132.The Permian mass extinction is hypothesized to have been caused by volcanic eruptions resulting in:
133.During the Permian extinction, what percentage of species in the ocean disappeared?
134.The LARGEST documented mass extinction on Earth occurred _____ million years ago.A)252B)25C)6.5D)65E)650
135.While we can use molecular clocks based on molecular sequence data to estimate the times at which various lineages diverged, we ultimately need the _____ to calibrate the clocks.

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