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The Invasion of Land 1
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Lecture 20
4/13/98
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| | This week, we will discuss of the invasion of land by life. We will start with the plants. |
| | We will then continue the discussion by focusing on the invertebrate and vertebrate groups that followed the plants. |
| | The invasion of land by plants is one of the major events in the history of Life |
| | Opened new environments for animals to utilize. |
| | Changed the nature of physical and chemical processes on earth. |
| | Living on land required new strategies for survival. |
| Requirements for living on land |
| | Rhynie Chert beds in Scotland |
| | Improvements on Rhyniophyte design |
| | development of secondary xylem (wood) |
| | development of true roots |
| | ancestors of modern club mosses |
| | male and female gametophytes form cones |
| Results of the plant invasion |
| | Increase size of Continents |
| | Changes in atmospheric chemistry |
| | Opening new environments for animals |
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