ASTR BC1753 Study Guide - Final Guide: Cambrian Explosion, Panspermia, Snowball Earth
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2-2. 7: oxygen accumulates in the atmosphere synodic month- 1 cycle of phases. Cambrian explosion: ~500 mya (most likely after snowball earth where competition died, allowed new species to rise) - incredible diversification of species, oxygen may have triggered this. 3: organic molecules become self-replicating-> rna, rna-> dna. Energy- lightning? (chemicals found naturally on earth react naturally to make complex organic molecules. Simpler cells that are smaller and have no nucleus, no membrane-bound organelles, circular chromosomes. Eukaryotes: more complex cells with nuclei, evolved later, can be multicellular, includes plants, fungi, animals, with a nucleus, membrane-bound organelles. Stuvia. com - the marketplace to buy and sell your study material. Powered by tcpdf (www. tcpdf. org) you estimate that the south celestial pole is at an altitude of 44 in the south. You see a full moon halfway between the eastern horizon and the zenith, and your watch tells you it"s 4 am est in nyc.
