Campbell Biology in Focus (2nd Edition)
2nd Edition
ISBN: 9780321962751
Author: Lisa A. Urry, Michael L. Cain, Steven A. Wasserman, Peter V. Minorsky, Jane B. Reece
Publisher: PEARSON
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Textbook Question
Chapter 23.1, Problem 1CC
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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Chapter 23 Solutions
Campbell Biology in Focus (2nd Edition)
Ch. 23.1 - Your measurements indicate that a fossilized skull...Ch. 23.1 - Describe an example from the fossil record that...Ch. 23.1 - WHAT IF? What might a fossil record of life today...Ch. 23.1 - Prob. 4CCCh. 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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- Explain why it is difficult to use carbon-14 dating on 100-million-year-old dinosaur fossilsarrow_forwardThe 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?arrow_forwardCarbon-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? Explainarrow_forward
- How do you think researchers and paleontologist determine where fossils of hominins are buried? answer must be at least 300 words in paragraph formatarrow_forwardCan you ID ancestral skulls and non-human primate skulls? At least, which is older?arrow_forwardA chimpanzee is our closest living ancestor (share 98% of DNA sequence), what adaptations to the skeleton system of humans do you think were most important?arrow_forward
- As discussed in the short film entitled: The Humans That Lived Before Us, which of the following is not associated with the Fossil remains known as “Lucy”? Group of answer choices a part of our genus a more human-like pelvis thighbone that angled inward toward the knees upright posturearrow_forwardWhat do you think geologists would find in the rock record as evidence of human life today million years later? Do you think we will leave a lot of traces and evidences of our existence in the fossil record?arrow_forwardA scientist digs in an undisturbed field and finds a leg bone of dinosaur A about 6 meters below the surface. She keeps digging and finds a jawbone of dinosaur B about 15 meters below the surface. Based on this information, which is the most likely conclusion? Dinosaur A lived before dinosaur B. Dinosaur B lived before dinosaur A. Both dinosaurs are from the same geologic period.arrow_forward
- Describe the difference you observe between the modern human skull’s chin and the Neanderthal skull’s lower jaw. What other differences do you observe between the two skulls?arrow_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_forwardIn your Introduction to Biological Anthropology class, your instructor asks you to examine a fossil skull and determine which species it is. You note there is a sagittal keel at the top of the skull. Based on this information alone, to which species does the skull belong? A. Australopithecus boisei B. Homo habilis C. Australopithecus garhi D. Homo erectusarrow_forward
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