Human Biology, 14 Edition
14th Edition
ISBN: 9781259245749
Author: Sylvia S. Mader Dr., Michael Windelspecht
Publisher: McGraw-Hill Education
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Textbook Question
Chapter 23.1, Problem 1LO
Describe the conditions of the early Earth’s atmosphere.
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The early atmosphere lacked which gas?
1. carbon dioxide
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3. amonia
4. nitrogen
Assuming that the early lithosphere had already been created, which sphere (the atmosphere or the hydrosphere) was formed next? Why do you say so? (explain constructively)
Before the emergence of life of what gases was the earth's primitive atmosphere constituted?
Chapter 23 Solutions
Human Biology, 14 Edition
Ch. 23.1 - Describe the conditions of the early Earth’s...Ch. 23.1 - Prob. 2LOCh. 23.1 - Prob. 3LOCh. 23.1 - Prob. 4LOCh. 23.2 - Prob. 1LOCh. 23.2 - Prob. 2LOCh. 23.2 - Discuss how the fossil record, biogeography, and...Ch. 23.2 - Prob. 4LOCh. 23.3 - Prob. 1LOCh. 23.3 - Prob. 2LO
Ch. 23.3 - Prob. 3LOCh. 23.4 - Prob. 1LOCh. 23.4 - Prob. 2LOCh. 23.5 - Explain the adaptations of Homo erectus.Ch. 23.5 - Prob. 2LOCh. 23.5 - Prob. 3LOCh. 23.5 - Prob. 1BMSCh. 23.5 - Prob. 2BMSCh. 23.5 - Prob. 1BMBCh. 23.5 - Prob. 2BMBCh. 23.5 - Prob. 3BMBCh. 23 - Prob. 1ACh. 23 - Prob. 2ACh. 23 - Prob. 3ACh. 23 - 4. The fossil record offers direct evidence for...Ch. 23 - 5. A history of how species change over time...Ch. 23 - Prob. 6ACh. 23 - Prob. 7ACh. 23 - Prob. 8ACh. 23 - Prob. 9ACh. 23 - Prob. 10ACh. 23 - Prob. 11ACh. 23 - Prob. 12ACh. 23 - Prob. 13ACh. 23 - Prob. 14ACh. 23 - Prob. 15ACh. 23 - According to the fossil record. which of these...Ch. 23 - Prob. 1TCCh. 23 - Prob. 2TCCh. 23 - Prob. 3TC
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- An abundance of___________ in Earths early atmosphere would have prevented the spontaneous assembly of organic compounds on early Earth. a. hydrogen b. methane c. oxygen d. nitrogenarrow_forwardWhat was the most significant contribution of early photosynthetic organisms to Earth’s environment?arrow_forwardWas there molecular oxygen in the earth's primitive atmosphere? How has that molecule become abundant?arrow_forward
- What were the consequences of an “oxygenated” Earth to life and to the atmosphere itself? (explain constructively)arrow_forwardDescribe the time line of appearances of different types of organisms on earth.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
- Describe how scientists have tested the hypothesis that simpleorganic molecules could have formed on the early Eartharrow_forwardAccording to the fossil record the first evidence of life was ___ years old: a) 3.5 Billion b) 4.5 Billion c) 2.5 Billion d) 3.5 Million e) 2.5 Millionarrow_forwardHow the evolution of oxygen was involved in the initial evolution of terrestrial life?arrow_forward
- What were the consequences of an “oxygenated” Earth to life and to the atmosphere itself? (explain)arrow_forwardName three different sources of energy that could have powered reactions on early earth to form organic compounds.arrow_forwardHow did the presence of molecular oxygen in the atmosphere affect early life?arrow_forward
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