BIO SCI 1A Lecture Notes - Lecture 6: Carl Linnaeus, Cyanobacteria, Phylogenetic Tree
5 Mar 2016
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Document Summary
Movement of the earth"s crust across the earth"s mantle. It is the biggest of 5 extinctions in the history of the world. 100 mya we have angiosperms (flowering plants) contrasted with gymnosperms. Hominids: 5 to 7 mya (split from common ancestor with chimpanzees) Life exclusively unicellular for most of earth"s history. Oxygen virtually absent from oceans and atmosphere for 2 billion years after the origin of life. Origin of animals (including land animals), land plants, fungi. Almost all life forms unicellular for 3 billion years. Rapid increase in animal diversity in fossil record (570-530 mya) All major animal body plans and parts appear by 530 mya shells, exoskeletons, heads, legs, eyes, muscles, brains. To note: the cambrian explosion was the most spectacular period of evolutionary change in the history of the world. Many descendent groups produced in wide variety of habitats, find food in variety of ways. Cambrian explosion: is an extremely large scale in radiation.
