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field experiment of CO2 levels

GREENHOUSE GASSED  In a long-running field experiment in Minnesota, scientists are studying the effects of rising atmospheric carbon dioxide levels on plots of grassland.

umbrella liverwort

NATURE’S DESIGN  The female reproductive structures of the umbrella liverwort, shown here, capture sperm-filled water droplets under their fronds.  

FRUIT PUNCH  The seed-studded fruit of a hairyflower wild petunia (Ruellia ciliatiflora) is hygrochastic, bursting open upon contact with water.

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