Astronomy Exam III Review 1. Earth has far less atmospheric carbon dioxide than Venus because: It’s locked up in rocks. 2. Snowball Earth refers to: One of a series of very deep ice ages that occurred more than 500 million years ago. 3. The primary process responsible for the Earth’s atmosphere was: Volcanic outgassing. 4. We have found evidence of life from each of the following eons: Achaean, Proterozoic, and Phanerozoic. 5. List the three lines of evidence that point to the single ancestor for all life on Earth: The discovery that al living organisms use DNA/RNA, ATP, and left-handed amino acids. 6. An organism heredity is encoded in: DNA 7. The first living organisms were probably: Cells without nuclei that used RNA as their genetic material. 8. The importance of the Miller-Urey experiment is that: It showed that natural chemical reactions can produce building blocks of life. 9. How does the requirement of organic building blocks constrain the prospects of habitability?: It requires that the planet’s host star be a second or third generation
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