Chapter 18 - Chapter 18: Basic Skills/ Definitions Quiz A:...

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Chapter 18: Basic Skills/ Definitions Quiz A: according to fossil evidence how far back in time did life on Earth exist? About 3.5 billion years or more. -we know this from stromatolites and fossils of singled celled organisms B: Why do scientists say that evolution is a “theory”? Because it explains a great deal about life and is supported by an enormous body of evidence C: What is a mutation? A change in a living cell’s DNA D: Based on DNA studies, it seems that all life on Earth: Shares a common ancestor E: Which of the following is considered by biologists to be likely place where life first arose on Earth? In hot water near undersea volcanoes F: How did oxygen get into Earth’s atmosphere? It was released by life through the process of photosynthesis. G: Which of the following is NOT considered crucial for life to exist on some world? An atmosphere H: Which of the following best describes what we mean by a habitable world? A planet or moon that could support life, if any life happened to be on it
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This note was uploaded on 04/03/2008 for the course ISP 205 taught by Professor Donahue during the Fall '08 term at Michigan State University.

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Chapter 18 - Chapter 18: Basic Skills/ Definitions Quiz A:...

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