What features of life [on Earth] are suggestive of a common origin?
Features common to all life forms on Earth are carbon-based orgainc chemistry, use of a common molecule to convey energy (ATP), and the storage of genetic information in DNA strands. 4. What is meant by panspermia? Panspermia is the idea that life spreads through the galaxy like a virus or bacteria, travelling on small or large particles through space, infecting any appropriate host (planet). Questions for Thought , page E5-10: 1. (write a one to two page essay). I graded on whether your essay was readable and logically self-consistent. 5. Use a method similar to the Drake equation to estimate the number of people getting a haircut at some given moment. That is, multiply the probabilities of each such event times the number of people in, for example, the United States. [modify as follows: how many people in Bloomington are getting a haircut … ] I estimate that there are about 60,000 people in Bloomington. People get their hair cut about once a month. When they get their hair cut they
