CAMPBELL BIOLOGY IN FOCUS-TEXT,AP ED.
3rd Edition
ISBN: 9780136811206
Author: Urry
Publisher: SAVVAS L
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Textbook Question
Chapter 23.1, Problem 2CC
Your measurements indicate that a fossilized skull you unearthed has a carbon-14fcarbon-12 ratio about 1/16 that of the skulls of present-day animals. What is the approximate age of the fossilized skull?
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The researchers found that the Neanderthal fossil had approximately0.0078 as much 14C as found originally in the atmosphere. (a) Usingthe numbers on your graph, determine how many half-lives havepassed since the Neanderthal died. (b) Using your 14C calibration onthe x-axis, what is the approximate age of the Neanderthal fossil inyears (round off to the nearest thousand)? (c) Approximately whendid Neanderthals become extinct according to this study? (d) Theresearchers cite evidence that modern humans (H. sapiens) becameestablished in the same region as the last Neanderthals approximately 39,000–42,000 years ago. What does this suggest aboutthe overlap of Neanderthals and modern humans?
Carbon-14 dating works for fossils up to about 75,000 years old;fossils older than that contain too little 14C to be detected. Mostdinosaurs went extinct 65.5 million years ago. (a) Can 14C be usedto date dinosaur bones? Explain. (b) Radioactive uranium-235 hasa half-life of 704 million years. If it was incorporated into dinosaurbones, could it be used to date the dinosaur fossils? Explain
(1) What is the most common way for a dead organism to avoid decomposition?
(2) Why do researchers look for fossils in places that are now dry and barren instead of
other places like forests or grasslands?
(3) What kind of dating from the lecture or textbook would be the best method for finding
the number of years ago when a volcanic rock was formed?
(4) Why is the pelvis of a biped shorter and wider than the pelvis of a quadruped?
(5) Does the overall shape of Lucy’s pelvis resemble the human pelvis or the chimpanzee pelvis more? Do not think of the size, but compare the outlines of each
bone.
This is Lucy's skelton below.
Chapter 23 Solutions
CAMPBELL BIOLOGY IN FOCUS-TEXT,AP ED.
Ch. 23.1 - Describe an example from the fossil record that...Ch. 23.1 - Your measurements indicate that a fossilized skull...Ch. 23.1 - WHAT IF? What might a fossil record of life today...Ch. 23.2 - Explain the consequences of plate tectonics for...Ch. 23.2 - Prob. 2CCCh. 23.2 - What factors promote adaptive radiations?Ch. 23.2 - Prob. 4CCCh. 23.3 - Explain how new body forms can originate by...Ch. 23.3 - Why is it likely that Hox genes have played a...Ch. 23.3 - MAKE CONNECTIONS Given that changes in morphology...
Ch. 23.4 - How can the Darwinian concept of descent with...Ch. 23.4 - Prob. 2CCCh. 23 - Which factor most likely caused animals and plants...Ch. 23 - Adaptive radiations can be a direct consequence of...Ch. 23 - A researcher discovers a fossil of what appears to...Ch. 23 - A genetic change that caused a certain Hox gene to...Ch. 23 - A swim bladder is a gas-filled sac that helps fish...Ch. 23 - SCIENTIFIC INQUIRY Herbivory (plant eating) has...Ch. 23 - FOCUS ON EVOLUTION Describe how gene flow, genetic...Ch. 23 - FOCUS ON ORGANIZATION You have seen many examples...Ch. 23 - SYNTHESIZE YOUR KNOWLEDGE In 2010, the Soufriere...
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- "Carbon 14 decays to carbon12. The half-life of the C14 isotope is 5730 years. 22920 years after an animal dies, ______ carbon 14 will have been replaced with carbon12 and only _____ will remain in a bone sample from the animals skeleton found by the archaeologists. " "More than 99 percent, less than 1 percent" "Three fourths (75 percent), one fourth (25 percent)" "15/16ths (94 percent), 1/16 (6 percent)" "62/64ths (97 percent), 2/64 (3 percent)"arrow_forwardRadiometric dating and the cranial capacity measurements are back from the paleolab for the specimen you discovered at the site you were excavating in South Africa. Lab results indicate that the cranial capacity is 520 cubic centimeters and it dates to about 1.5 million years ago. After having identified the cranial traits present, you can now take this new information and provide, at least, the genus to which you think it may belong. Based on this information, choose from the options below, the category to which you think it most likely belongs. -Pre-australopith -Premodern Human -Gracile Australopithecine -Early Genus Homo -Robust Australopithecine -Late Genus Homoarrow_forwardRadiometric dating and the cranial capacity measurements are back from the paleolab for the specimen you discovered at the site you were excavating in South Africa. Lab results indicate that the cranial capacity is 520 cubic centimeters and it dates to about 1.5 million years ago. After having identified the cranial traits present, you can now take this new information and provide, at least, the genus to which you think it may belong. Based on this information, choose from the options below, the category to which you think it most likely belongs. Group of answer choices Pre-australopith Premodern Human Gracile Australopithecine Early Genus Homo Robust Australopithecine Late Genus Homoarrow_forward
- Which radioactive isotope or isotopes would you use to date each of thefollowing objects? Explain each of your choices. 4.) A fossilized trilobite recovered from a bed of sandstone that is about 500million years oldarrow_forwardImagine you were to find a fossilized animal bone containing one-eighth the amount of carbon-14 present in earth’s atmosphere today. How long ago did the animal die?arrow_forwardAccording to "Our Earliest Ancestors", why can’t scientists just do DNA analysis on these fossil hominins to determine if they are a separate species and possibly what species they belong to? A.The technology for extracting DNA from fossils hasn't been developed yet. B.Scientists can't perform DNA analysis on fossil hominins because the fossils have been contaminated with modern human DNA over the years, making it impossible to isolate the ancient genetic material. C.The fossils would need to be in a -5 degree Celsius environment to prevent DNA from degrading D.The DNA of fossil hominins is too similar to modern humans, making it difficult to distinguish between them.arrow_forward
- Radiometric dating and the cranial capacity measurements are back from the paleolab for the specimen your friend at the museum called you about. She calls again to tell you the results. The cranial capacity is 442 cubic centimeters and it dates to 3 million years ago. After having identified the cranial traits present, you can now take this new information and provide, at least, the genus you think it could belong to in order to help your friend. Based on this information, choose from the options below, the category to which you think it most likely belongs. Group of answer choices Robust Australopithecine early Genus Homo Pre-Australopith Late Genus Homo Gracile Australopithecine Premodernarrow_forwardBecause the Laetoli footprints date to 3.6 mya and they are clearly made by a bipedal hominin, it is likely that they were made by Australopithecus afarensis, who appears to have been the only hominin around at that time. True O Falsearrow_forwardWhat kind of fossils were formed out of dinosaur remains and activities? Why do you say so? (Give three)arrow_forward
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