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1. 
"It is not true that" deserts are unpopulated -they are home to almost one-sixth of the world's population. (Far from)
2. 
Many animals burrow underground to avoid the harsh sun, "and" they are nocturnal. (In addition to)
3. 
Plants such as cacti "not only" have long roots, "but they" can store their own water. (Apart from)
4. 
Some desert plants survive for hundreds of years "because of" these kinds of adaptations. (thanks to)
5. 
Many desert areas are expanding "because" humans graze animals in semi-arid areas. (on account of)
6. 
Environmentalists are concerned "that" these farming practices have caused desertification. (about)