Biology: Life on Earth (11th Edition)
11th Edition
ISBN: 9780134168296
Author: Gerald Audesirk, Teresa Audesirk, Bruce E. Byers
Publisher: PEARSON
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Textbook Question
Chapter 18, Problem 1RQ
What is the evidence that life might have originated from nonliving matter on early Earth?
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What evidence is there for the hypothesis that life originated on Earth by the creation and polymerization of small organic molecules by natural processes?
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Which molecule -DNA or RNA- do scientist believe was found in the first life form on Earth? Why do scientist believe this molecule was first to form life?
Chapter 18 Solutions
Biology: Life on Earth (11th Edition)
Ch. 18 - 1. Almost all of the oxygen gas in today’s...Ch. 18 - Extinction a. generally does not occur except...Ch. 18 - 3. In the endosymbiotic origin of the...Ch. 18 - 4. Which of the following does not list...Ch. 18 - Prob. 5MCCh. 18 - 1. Because there was no oxygen in the earliest...Ch. 18 - 2. The molecule ________ became a candidate for...Ch. 18 - 3. Complex cells that contain a nucleus and other...Ch. 18 - 4. The sperm of early land plants had to reach the...Ch. 18 - 5. Early plants that protected their seeds within...
Ch. 18 - Prob. 6FTBCh. 18 - Amphibians gave rise to ____________, which had...Ch. 18 - 1. What is the evidence that life might have...Ch. 18 - Prob. 2RQCh. 18 - 3. Explain the endosymbiont hypothesis for the...Ch. 18 - 4. Name two advantages of multicellularity for...Ch. 18 - What advantages and disadvantages would...Ch. 18 - 6. Outline the major adaptations that emerged...Ch. 18 - Outline the evolution of humans from early...Ch. 18 - Extinctions have occurred throughout the history...Ch. 18 - In biological terms, what do you think was the...
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- Direct evidence of life on early Earth comes from fossils of microorganisms that lived 3.5 billion years ago. But how did the first living cells appear?arrow_forwardthe landmark experiment by Miller and Urey, and various repeats of this experiment, did not successfully recreate life itself, but why do we consider the results from this experiment as support for the origin of life on Earth?arrow_forwardWhat is the most accepted hypothesis on the origin of life on earth? How does it compare to the other main hypotheses?arrow_forward
- Why does there appear to have been only one origin of life on earth? Why are there not multiple origins? Why is life not originating still?arrow_forwardWhat two pieces of evidence support the claim that all life on Earth descended from a common ancestor?arrow_forwardHow did life first begin on Earth?arrow_forward
- For 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_forwardBased on the Origin of Life by John H. McClendon, how did life on earth start based on the different theories?arrow_forwardThe formation of the first living organism is still a mystery. Outline and explain the steps in the origin of life. Explain where the original organisms must have lived and why?arrow_forward
- Identify the stages of the origin of life hypothesis.arrow_forwardScientists Stanley Miller and Harold Urey set up an experiment modeling the environmental conditions thought to exist during the early stages of Earth's formation. The setup of Miller and Urey's experiment is shown below. Which conclusion about the origin of life could be drawn from the potential results of this experiment? Life assembled from chemical building blocks. Life began when water vapor became electrified. Life evolved from the DNA of simple unicellular organisms. Life began when salt water caused a mutation in an ancient virus.arrow_forwardWhat evidence would you look for on Enceladus, Europa or Mars that would tell you that life may have existed there in the past?arrow_forward
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Theory of Spontaneous generation | Abiogenesis and Biogenesis |; Author: subrata das;https://www.youtube.com/watch?v=tcyESFngVPk;License: Standard YouTube License, CC-BY