BIOLOGY 171 Chapter Notes - Chapter let 14 vocab: Cambrian Explosion, Feathered Dinosaur, Silurian
18 Mar 2019
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Lecture 13 vocab adaptive radiation: a period of unusually rapid evolutionary diversi cation in which natural selection accelerates the rates of both speciation and adaptation in a single lineage. Animals: the colonization of land by animals began only after plants had established themselves there. Insects, descended from crustacean ancestors that independently gained access to the land surface, appeared at about the same time. Archaeopteryx: is a genus of bird-like dinosaurs that is transitional between non-avian feathered dinosaurs and modern birds. Archean eon: (4 to 2. 5 bya: earth during archean eon: oceans, volcanism, atmosphere- no oxygen, first cells, Important because they are photosynthetic, carting out chemical reaction to release free oxygen- earliest organisms to produce oxygen: changed chemistry of planet, oxygenated oceans and atmosphere. Aves body fossils: body fossils are the most common type of fossil found across the world. They are formed from the remains of dead animals and plants. We do get soft body fossils occasionally but not often.
