/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

/ɪkˈstriːm/ (Adj.) Very severe or difficult Many plants cannot endure the _______ heat of the desert.

/trænˈzɪʃənəl, -ˈsɪ-/ (Adj.) Relating to change from one type to another _______ areas between the open desert and oases on the desert fringe support diverse plant forms.

/ɪˈvæpəreɪt/ (n.) The change from liquid to gas, Loss of water to the air P. euphratica controls _______ by opening and closing the stomata, or tiny pores.

/ˈmekənɪzəm/ (n.) Behavior to deal with difficult situations Although they share many survival strategies, each has developed unique coping _______ s of its own.