Biology
12th Edition
ISBN: 9780134813448
Author: Audesirk, Teresa, Gerald, Byers, Bruce E.
Publisher: Pearson,
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Chapter 18.2, Problem 1TC
Uranium-235, with a half-life of 713 million years, decays to lead-207. If you analyze a rock and find that it contains uranium-235 and lead-207 in a ratio of 1:1, how old is the rock (assuming that decay of uranium-235 is the only source of lead-207)?
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Chapter 18 Solutions
Biology
Ch. 18.1 - How Would the experiments result charge if oxygen...Ch. 18.1 - describe a likely scenario for the origin of life?Ch. 18.1 - describe, for each step in the scenario, some...Ch. 18.2 - Uranium-235, with a half-life of 713 million...Ch. 18.2 - Scientists have identified a free living bacterium...Ch. 18.2 - describe scenarios for the major evolutionary...Ch. 18.2 - State the order in which these events occurred,...Ch. 18.3 - describe fossil evidence of the earliest...Ch. 18.3 - describe the advantages that fostered the origin...Ch. 18.3 - Prob. 3CYL
Ch. 18.4 - Prob. 1TCCh. 18.4 - Does the mudskippers ability to walk on land...Ch. 18.4 - Can ancient DNA reveal the secrets of dinosaur...Ch. 18.4 - Although it may never be possible to recover DNA...Ch. 18.4 - describe the transitions and innovations...Ch. 18.4 - describe the advantages gained by the first plants...Ch. 18.5 - Scientists have cloned a number of animal species,...Ch. 18.5 - explain how extinction has affected the course of...Ch. 18.5 - describe the likely causes of mass extinctions in...Ch. 18.6 - We might be able to more easily distinguish...Ch. 18.6 - Paleontologists recently discovered fossil...Ch. 18.6 - describe the evolutionary history of humans and...Ch. 18.6 - name and describe some characteristics of the...Ch. 18.6 - describe the key features of the most recent phase...Ch. 18.6 - The unexpected discovery that humans interbred...Ch. 18 - Almost all of the oxygen gas in todays atmosphere...Ch. 18 - Extinction a. generally does not occur except...Ch. 18 - In the endosymbiotic origin of the mitochondrion,...Ch. 18 - Which of the following does not list evolutionary...Ch. 18 - Prob. 5MCCh. 18 - Because there was no oxygen in the earliest...Ch. 18 - The molecule _________ became a candidate for the...Ch. 18 - Complex cells that contain a nucleus and other...Ch. 18 - The Sperm of early land plants had to reach the...Ch. 18 - Prob. 5FIBCh. 18 - Prob. 6FIBCh. 18 - Prob. 7FIBCh. 18 - What is the evidence that life might have...Ch. 18 - How did the origin of photosynthesis affect...Ch. 18 - Explain the endosymbiont hypothesis for the origin...Ch. 18 - Name two advantages of multicellularity for plants...Ch. 18 - What advantages and disadvantages would...Ch. 18 - Prob. 6RQCh. 18 - Prob. 7RQCh. 18 - Extinctions have occurred throughout the history...Ch. 18 - In biological terms, what do you think was the...
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- If the half-life of a radioisotope is 20,000 years, then a sample in which three-quarters of that radioisotope has decayed is _______ years old. a. 15,000 b. 26,667 c. 30,000 d. 40,000arrow_forwardMiller and Urey created a reaction chamber that simulated conditions in Earths early atmosphere to test the hypothesis that______. a. lightning-fueled atmospheric reactions could have produced organic compounds b. meteorites contain organic compounds c. organic compounds form at hydrothermal vents d. oxygen prevents formation of organic compoundsarrow_forwardThe picture below shows the position of Earth and two stars. Star 1 is 18 light years from Star 2 and 34 light years from Earth. If Star 2 explodes as a supernova, in how many years would the explosion be seen from Earth? (3 points) Group of answer choices 18 34 70 52arrow_forward
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- If 1 meter equals 1 billion years and each millimeter is 1 million years, is 4.6 meters 4,600 million years ago (mya) or is it 4,600 bya? And if I measure it out on my timeline, isn’t 4.6 meters like 15 feet long?! Thanksarrow_forwardWhat was the composition of the earth’s atmosphere at the time of the origin of life, and how did it differ from the atmosphere of today?arrow_forwardFor how long has there been life on Earth? For what percentage of time has life existed on Earth? For about how many years of geological time have human existed on earth?arrow_forward
- what can you say about the story of earth?arrow_forwardVolcanic ash can be used to date fossil finds because each time it is expelled by an eruption it has the same relative proportions of radioactive isotopes. True or Falsearrow_forwardRadiometric dating is a technique used to determine the age of rocks. Geologists have used this technique to determine that: A. The universe started with the "Big Bang." B. Earth is about 6.2 trillion years old, and life appeared on Earth about 4.9 trillion years ago. C. Earth is about 4.6 billion years old, and life appeared on Earth about 4.1 billion years ago. D. Earth is about 4.6 million years old, and life appeared on Earth about 4.4 million years ago. E. Earth is about 6.2 thousand years old, and life appeared on Earth about 6 thousand years ago.arrow_forward
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