[BIO 200] - Midterm Exam Guide - Everything you need to know! (68 pages long)
5 Oct 2016
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Where did life originate: happened 3. 8 billion years ago, key questions b. i. How did we get from no life to life? b. iii. Did life evolve on earth or elsewhere in the universe? b. iii. 1. Panspermia theory that life was seeded onto our planet from elsewhere b. iii. 2. Regardless, at some point somewhere, something that was not alive became alive whether this happened on earth or not. b. iii. 3. A central question evolutionary biologists examine is how this might have occurred. Characteristics of life: at its most basic level, life always has two major characteristics: a. i. It is important to use the broadest definition possible, since early life may have been very different from today. The earth before life: before life, earth was in the hadean eon a. i. Molten rock was the only solid surface a. i. 1. a. i. 2. As a result, all early life was aquatic a. ii. The atmosphere was made up of methane, hydrogen, ammonia, water vapor, etc. a. ii. 2.
