Chapter 21 Outline

Chapter 21 Outline - Chapter 21 Outline 1) Precambrain Era:...

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Chapter 21 Outline 1) Precambrain Era: longest, earliest (4.5 bya-600 mya) a) Precambrian (not divided into periods) i) Mostly microscopic prokaryotes living in oceans ii) Approximately 2/3 of way through this era,                                   evolved iii) Late Precambrian—many                                           ,                                                animals had evolved. iv) Oxygen begins to appear in the atmosphere as a                            product; well below current  levels 2) Palezoic Era: (542-297 mya) a) Cambrian: 542-488 mya i) Beginning of                                                                    ii) Concentration of O 2  was…? iii) Continents… iv) Largest land mass was called                                                 . v) Cambrian explosion: b)                           : 488-444 mya
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i) Great radiation of… ii) At the end of the period,                                                                                              formed over                                   . iii) Due to the glaciers, sea levels                                                , causing… c) i) ii) First                                          plants appeared late during this period iii) The first                                                                                               also appeared. d) Devonian:                                                 i) The northern landmass                                                and the southern landmass                                                      moved                                                  each other. ii)
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This note was uploaded on 04/13/2008 for the course BIO 1306 taught by Professor Adair,tamarah during the Spring '08 term at Baylor.

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Chapter 21 Outline - Chapter 21 Outline 1) Precambrain Era:...

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