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Unformatted text preview: Plants provide fuel Human necessities and Luxuries Plants provide medicine o Aspirin: Willow o Taxol: yew o Morphine: poppy Plants provide pleasure o Flowers, gardens, and lawns o Coffee, chocolate, tea, wine, fruits The plant evolutionary tree Major steps in the evolution trees o Vascular system o Seeds and spores o Flowering and fruits Evolutionary Origin of Plants Green algae DNA similarties Some tyhpes of cholorphyll and accessory pigments Food stores as starch Cell walls made of cellulose Early ancestors Most green algae in fresh water o Suggests that early plants evolved in freshwater habitats Early evolutionary pressure to withstand the challenges to freshwater habitat Terrestrial Adaptations Roots are rootlike structures o Anchor plants o Absorb water from soil Waxy cuticle covers leaves and stems o Reduces evaporative water loss Stomata o Allow gas exchange when open o Can close and open...
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