GSC 102 Lecture Notes - Lecture 8: Chordate, Internal Fertilization, Sea Slug
16 Sep 2018
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Archean domain (fossils or organisms) direct evidence says 2. 5 billion years ago. Bacterial domain cyanobacteria indirect evidence says 3. 5 billion years ago. In the fossil record, direct evidence says the archean domain is first. Luca, archeans, or bacteria any answer is correct, but must provide the evidence for it. Luca is all theoretical evidence; but theoretical data is also valid. Adam and eve; last evidence for stuff but doesn"t mean there wasn"t life before. Archean: field evidence (actually found archeans; also chemosynthetic process of. Archeans makes sense based on the geochemical process we understand archeans to be) We are still in the phanerozoic eon because life is still evident. We now have sand (sediment), shells (animals with hard parts), seaweed. Sea animals have specialized organisms, defense mechanisms becoming highly adapted. Continent is laurentia at the beginning of the cambrian. Equator is going straight up and down meaning laurentia is tilted (not the planet that is tilted)
