Context: The central Sahara is estimated to include five hundred species of plants, which is extremely low considering the huge extent of the area. Plants such as acacia trees, palms, succulents, spiny shrubs, and grasses have adapted to the arid conditions, by growing lower to avoid water loss by strong winds, by storing water in their thick stems to use it in dry periods, by having long roots that travel horizontally to reach the maximum area of water and to find any surface moisture and by having small thick leaves or needles to prevent water loss by evapo-transpiration. Plant leaves may dry out totally and then recover.

Question: What is the number of plants in the Central Sahara?
Answer: five hundred species

Question: What do plants do in order to avoid water loss?
Answer: growing lower

Question: Where do plants store their water to avoid the conditions?
Answer: thick stems

Question: What helps plants in order to get as much water as   possible?
Answer: long roots that travel horizontally

Question: what desert area  has 500 species of animals?
Answer: Unanswerable

Question: What type of plants have partially adapted to the arid conditions?
Answer: Unanswerable

Question: what do plants release through their stem?
Answer: Unanswerable

Question: What does the central Sahara have an unusually large number of given its area?
Answer: Unanswerable

Question: How many acacia trees are there in central Sahara?
Answer: Unanswerable

Question: Why do many plants grow higher than normal in the Sahara?
Answer: Unanswerable

Question: What in the Sahara grows its roots vertically?
Answer: Unanswerable

Question: What aspect of the plants' leaves allows them to lose water?
Answer: Unanswerable