Cos 10 - Class 11 Thursday, February 14, 2008 11:04 AM...

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Class 11 Thursday, February 14, 2008 11:04 AM Flying probably came before echolocation Invasion of Land Plants 450 mya Invertebrates 410 ma Vertebrates 370 ma Problems to be overcome in making the transition to land include: Lack of support (gravity) Dessication Near absence of dissolved nutrients and gases No liquid medium for transport of gametes Plant solutions Support: evolution of lignin (an organic compound that strengthens plants) and cellulose (wood Dessication: evoltion of waxy outer cover cuticle Gas exchange: Stomata Feeding/drinking: eovltion of roots and internal transport system, xylem
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Reporduction: spores thatcould be win dispersed, then seeds that didn't require water for fertilization Symbiosis: fungus extracts nutrients form terock that are used by the algae and the algae returns energy to the fungus via photosynthesis 427-470 myo fossil spores provide the earliest evidence for life on land Fossilized cuticle Cooksonia First plant to exhibit upright, branched stems Produced spores
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This note was uploaded on 06/04/2008 for the course GE CLUST 70B taught by Professor Morris during the Spring '07 term at UCLA.

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Cos 10 - Class 11 Thursday, February 14, 2008 11:04 AM...

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