Understanding Our Universe
3rd Edition
ISBN: 9780393614428
Author: PALEN, Stacy, Kay, Laura, Blumenthal, George (george Ray)
Publisher: W.w. Norton & Company,
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Chapter 18, Problem 22QAP
To determine
The reason why silicon based life is unlikely.
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Chapter 18 Solutions
Understanding Our Universe
Ch. 18.1 - Prob. 18.1CYUCh. 18.2 - Prob. 18.2CYUCh. 18.3 - Prob. 18.3CYUCh. 18.4 - Prob. 18.4CYUCh. 18 - Prob. 1QAPCh. 18 - Prob. 2QAPCh. 18 - Prob. 3QAPCh. 18 - Prob. 4QAPCh. 18 - Prob. 5QAPCh. 18 - Prob. 6QAP
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- Why is liquid water generally considered necessary for the origin of life?arrow_forwardThe evidence is overwhelming that the Grand Canyon was dug over a span of millions of years by the erosive power of the Colorado River and that river's tributary streams. Does this evidence support a catastrophic theory or an evolutionary theory?arrow_forwardWhat is the difference between chemical evolution and biological evolution?arrow_forward
- Why was the development of photosynthesis a major milestone in the evolution of life?arrow_forwardMolecules of which gas were needed in Earths atmosphere for life to evolve from living in the sea to living on the land? Why?arrow_forwardWhy are upper-main-sequence (high-luminosity) host stars unlikely sites for intelligent civilizations?arrow_forward
- Consider Figure 25-8. What is the ratio of the length of time since the origin of fish to the time since the origin of mammals? What does this value indicate?arrow_forwardLife on Earth exists because of oxygen in Earths atmosphere. True false? Explain your answer.arrow_forwardWhat is a habitable zone?arrow_forward
- If you represent Earths history by a line that is 1 m long, how long a segment would represent the 400 million years since life first moved onto the land? How long a segment would represent the 4-millionyear history of humanoid life?arrow_forwardDoes all life on Earth require sunshine?arrow_forwardMars and Europa are two Solar System bodies that are considered possible habitats for Earth-like life. Why?arrow_forward
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