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    1. /stresə $ -ər/ Something that causes great difficulties The main _______ in a desert is lack of rain.

    2. /daɪˈluːt $ dɪˈluːt, daɪ-/ To make weaker by mixing with water It _______ s the normally toxic salt by increasing the number and volume of its cells.

    3. /spɑːs $ spɑːrs/ (Adj.) Small in numbers or amount _______ rainfall, daily temperature swings of up to 20°C, and violent sandstorms make it one of the most

    4. /swɪŋ/ (n.) A sudden or big change Sparse rainfall, daily temperature _______ s of up to 20°C, and violent sandstorms make it one of the most extreme environments on Earth

    5. /dɪˈtɜːmɪn $ -ɜːr-/ To decide Tamarisk can naturally _______ when to close stomata to inhibit evaporation