[ 189 ] Life Science GED ® TEST SCIENCE FLASH REVIEW • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • Radiocarbon decay 100.0 90.0 80.0 70.0 60.0 50.0 40.0 30.0 20.0 10.0 0.0 0 5,000 10,000 15,000 20,000 25,000 30,000 35,000 40,000 Amount of C14 remaining (%) Time (years) A scientist finds a fossilized bone that has about 25% of the natural amount of the C14 remaining. Using the chart, what is the approximate age of the bone? Which of the following statements explains how biogeography is evidence for evolution? A. Offspring carry the traits of both parents. B. Different species are not likely to interbreed. C. The fossil record shows the sequence of evolution in layers of sediment. D. Neighboring species in different habitats often can share a common ancestor.