BIOLOGY
4th Edition
ISBN: 9781266739606
Author: Hoefnagels
Publisher: MCG
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Textbook Question
Chapter 19.6, Problem 2MC
What are some alternative hypotheses for why the researchers failed to recover any DNA from sediments that were more than 400,000 years old? How would you test your hypotheses?
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One type of fish fossil is found only in a rock layer near the bottom of a canyon, while a different kind of fish fossil is found only in a rock layer 4,000 feet higher, near the top of the canyon. Which statement would a scientist most likely offer to explain this situation?
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Chapter 19 Solutions
BIOLOGY
Ch. 19.1 - Prob. 1MCCh. 19.1 - Prob. 2MCCh. 19.1 - How does vascular tissue adapt plants to land?Ch. 19.1 - Describe the reproductive adaptations of plants.Ch. 19.2 - Describe the three main groups of bryophytes.Ch. 19.2 - Prob. 2MCCh. 19.3 - Describe the four groups of seedless vascular...Ch. 19.3 - Prob. 2MCCh. 19.3 - Prob. 3MCCh. 19.4 - What are the characteristics of gymnosperms?
Ch. 19.4 - What are the four groups of gymnosperms?Ch. 19.4 - Prob. 3MCCh. 19.4 - What happens during and after pollination in...Ch. 19.5 - Prob. 1MCCh. 19.5 - Prob. 2MCCh. 19.5 - Prob. 3MCCh. 19.5 - Prob. 4MCCh. 19.6 - Prob. 1MCCh. 19.6 - What are some alternative hypotheses for why the...Ch. 19 - Which of the following is NOT a similarity between...Ch. 19 - Prob. 2MCQCh. 19 - What conditions did plants face when they moved to...Ch. 19 - Prob. 4MCQCh. 19 - Prob. 5MCQCh. 19 - Which adaptation to land is present in the most...Ch. 19 - Which type of plant may have a gametophyte that is...Ch. 19 - Reproduction in a pine tree is associated with a....Ch. 19 - In comparing the life cycle of an angiosperm to...Ch. 19 - What plant group is correctly matched with an...Ch. 19 - What characteristics do all land plants have in...Ch. 19 - Prob. 2WIOCh. 19 - How are terrestrial habitats different from...Ch. 19 - List the characteristics that distinguish the four...Ch. 19 - Prob. 5WIOCh. 19 - A fern plant can produce as many as 50 million...Ch. 19 - How do the adaptations of gymnosperms and...Ch. 19 - Prob. 8WIOCh. 19 - Describe how the petals, ovary, and ovule of...Ch. 19 - The immature fruit of the opium poppy produces...Ch. 19 - Scientists have studied plant populations that...Ch. 19 - Prob. 12WIOCh. 19 - Prob. 13WIOCh. 19 - Prob. 14WIOCh. 19 - Compare and contrast the life cycles of the four...Ch. 19 - Prob. 17WIOCh. 19 - Prob. 18WIOCh. 19 - What are the pros and cons of pursuing biofuels as...Ch. 19 - Prob. 1PITCh. 19 - Prob. 2PITCh. 19 - Prob. 3PITCh. 19 - Prob. 4PIT
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- Explain why it is difficult to use carbon-14 dating on 100-million-year-old dinosaur fossilsarrow_forward9) Rocks containing fossil evidence have been found in Canada suggesting how life on Earth evolved. What about the rocks led to this belief? A) They contained graphite, a from of pure carbon. B) They contained fossil evidence of human remains. C) They were metamorphic rocks with traces of water. D) They were extrusive rocks that came from the volcanic vents. Not Gradedarrow_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
- How does finding the same fossils of a land animal on two different continents support the hypothesis of continental drift? A) The land animal fossil is now found in colder parts of the world which means the continents had drifted since the fossils were made. B) The land animal fossil could only have ended up fossilized on both continents if they were once together C) The land animal fossil was unable to swim across oceans so the fact that its fossils were found on distant continents suggested those continents had once been fused together as later moved apart. D) The land animal fossil wasnt found in Asia which wegner thought was only stable continent that hadn’t moved.arrow_forwardplease send me answerarrow_forwardA scientist has a fossil that was found in a layer of rock close to Earth’s surface. He believes that the fossil is around 12,000 years old. Which method would best allow the scientist to confirm the actual age of the fossil? finding another fossil in a deeper layer of rock finding another fossil in the same layer of rock using carbon/nitrogen absolute dating using potassium/argon absolute datingarrow_forward
- One problem in radiocarbon dating of biological samples, especially very old ones, is that they can easily be contaminated with modern biological material during the measurement process. What effect would such contamination have on the estimated age? Why is such contamination a more serious problem for samples of older material than for samples of younger material?arrow_forwardWhich of the following shows the correct sequence of periods in the Mesozoic era: a) Triassic, Jurassic, Cretaceous b) Cretaceous, Jurassic, Triassic c) Jurassic, Cretaceous, Triassic d) Triassic, Cretaceous, Jurassicarrow_forwardThe Beringia hypothesis has been accepted for many years, but newer DNA evidence from sagebrush, trees, woolly mammoths, bison, rabbits, and other species found in sediments of ancient lakes that once separated the retreating glaciers suggest that the most recent land bridge was actually 12,600 years ago and not 25,000 to 15,000 years ago. How would these new findings alter the explanation for evidence of humans in North America dating to before 12,600 years ago?arrow_forward
- Would you anticipate the DNA sequences of people living in what is now known as Italy in 1000BC to be similar to those living in the same area in 1900BC? If so, why or why not?arrow_forwardWhen a radio-isotope in a fossil with a half-life of 4,000 years has been reduced to 25% of its original amount, how old is the fossil?arrow_forwardI would like you to assist me in setting up a dating profile on Hominin (homo sapien). Would you date a hominin? Australopithecus afarensis is famous thanks to Lucy, but Paranthropus robustus could be a diamond in the rough! Once again, let's have a little fun with this learning activity. Showcase your knowledge of the important attributes of one of the fossil hominins covered in this Unit by writing a dating profile for one. Creativity is welcome and encouraged! But all of the responses on this dating profile should relate to/be unique to the fossil hominin you choose. There must be good reasons for your answers that relate to the morphology, physiology, behavior, and/or environment of your chosen hominin. Have a short introduction of Homonin you choose, and answer the questions below: What are your best physical features and why? What are your special skills and/or favorite hobbies? What are you looking for in a partner? What is your favorite food? What are you…arrow_forward
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