Biology: The Unity and Diversity of Life (MindTap Course List)
14th Edition
ISBN: 9781305073951
Author: Cecie Starr, Ralph Taggart, Christine Evers, Lisa Starr
Publisher: Cengage Learning
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Chapter 19, Problem 1DAA
The Changing Earth Studies of ancient rocks and fossils can reveal changes that have taken place during Earth’s existence. FIGURE 19.13 shows how asteroid impacts and the composition of the atmosphere are thought to have changed over time. Use this figure and information in the chapter to answer the following questions.
FIGURE 19.13 Charges in the abundance of asteroid impacts (green), atmosphere carbon dioxide concentration (pink), and atmospheric oxygen (blue) over geologic time.
1. Which occurred first, a decline in asteroid impacts, or a rise in the atmospheric level of oxygen (O2)?
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Scientists are examining the possible role of a large asteroid in the cretaceous mass extinction event. A large asteroid strike would likely have caused rapid climate cooling and the diffusion of sunlight. which of the following statements are the best null and alternative hypotheses when scientists look at the geologic evidence of extinction related to the asteroid strike?
Scientists are examining the possible role of a large asteroid in the Cretaceous mass
extinction event. A large asteroid strike would likely have caused rapid climate cooling and
diffusion of sunlight.
Which of the following statements are the best null and alternative hypotheses when
scientists look at the geologic evidence of extinction related to the asteroid strike?
Null: The rate of extinction would be steady over the entire length of time the climate was
altered. Alternative: The rate of extinction would be greatest immediately before the
asteroid strike.
Null: The rate of extinction would gradually decrease over the entire length of time the climate
was altered. Alternative: The rate of extinction would be at its lowest immediately after the
asteroid strike.
Null: The rate of extinction would be steady over the entire length of time the climate was
altered. Alternative: The rate of extinction would be greatest immediately after the asteroid
strike.
Null: The rate of extinction…
Chapter 19 Solutions
Biology: The Unity and Diversity of Life (MindTap Course List)
Ch. 19 - According to the big bang theory, _______. a. the...Ch. 19 - An abundance of _______ in Earth's early...Ch. 19 - The Changing Earth Studies of ancient rocks and...Ch. 19 - Prob. 2DAACh. 19 - Prob. 3DAACh. 19 - Prob. 4DAACh. 19 - Stanley Millers experiment demonstrated...Ch. 19 - According to one hypothesis, negatively charged...Ch. 19 - The prevalence of _______ in living organisms is...Ch. 19 - Prob. 6SQ
Ch. 19 - Among prokaryotes, only the cyanobacteria _______....Ch. 19 - The evolution of _____ resulted in an increase in...Ch. 19 - Bacteria that cause the disease typhus arc close...Ch. 19 - Infoldings of the plasma membrane into the...Ch. 19 - Prob. 11SQCh. 19 - A stromatolite is a structure __________. a....Ch. 19 - Prob. 13SQCh. 19 - Evidence that Mars __________ suggests that it may...Ch. 19 - Chronologically arrange the evolutionary events,...Ch. 19 - Researchers looking for fossils or the earliest...Ch. 19 - The astronomer Carl Sagan once said, "We are made...Ch. 19 - How did the evolution of oxygen-releasing...
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- (e) If you collected a sample of water being ejected from Saturn's moon, Enceladus, you could examine it for isotopic signatures of life. Explain why this might not be definitive and describe one other way in which you could test a sample of this water for biological material.arrow_forwardA fossil is found to contain the radioactive parent and daughter isotopes uranium 235U, and lead 207Pb, in the ratio 12.5% to 87.5%. Assuming that no 207Pb was present when the fossil first formed, estimate the age of this sample.Please show some thought process and a therefore statement. Thank you very much, have a great day!arrow_forwardScientist have determined that the early Earth had no free oxygen anywhere. Briefly explain what evidence in the rock layers that scientists found to prove when the early conditions on earth had free oxygen in the atmosphere.arrow_forward
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