Biology 1002B Chapter Notes - Chapter 3: Interstellar Cloud, Hydrogen Sulfide, Alexander Oparin
22 Jan 2017
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Chapter 3 defining life and its origins. The elements and atoms found in living things are also found in non living things. Living cells obey the same fundamental laws of physics and chemistry as non-living cells. Called emergent because they emerge from many simpler interactions that individually do not have the properties the high level does. E. g. ter(cid:373)ites (cid:271)uild their (cid:858)(cid:272)athedral(cid:859) (cid:272)ell (cid:271)y (cid:272)ell unaware of the overall structure. Earth is about 4. 6 billion years old. Life started about 4 billion years ago. First evidence of prokaryotic life was about 3. 5 billion years ago. Fossil evidence of eukaryotic life dates back about 2 billion years ago. A(cid:374)i(cid:373)als do(cid:374)(cid:859)t sho(cid:449) up u(cid:374)til a(cid:271)out 525 (cid:373)illio(cid:374) years ago. Extinction of dinosaurs was completed by about 65 million years ago. 3. 2b earth lies within the habitable zone around the sun. Once earth was formed, it took approximately 500 million years to cool.
