The camel is about the only beast of burden that would be capable of providing reliable transportation in a desert.
A car built for the terrain, or an airplane/helicopter.
Bedouins are the desert nomads who use camels.camel
The best thing that can be done for deserts is for man to stop trashing them. When driving in the desert, stay on approved roads and do not go cross country on your ATV, dirt bike or 4WD. It tears up the habitat for animals and plants and can take centuries to heal. The desert is actually quite fragile. Deserts should not be used as a garbage dump. Trash is unsightly and a hazard for man, plants and animals. Dumping used oil in the desert is also a no-no. Oil is toxic to both plants and animals and does nothing to beautify the desert. The best thing man can do is leave the desert alone and enjoy it for its rugged, harsh beauty.
The reason that there are less animals in the desert is because the animals that live in the rain forest are used to having more oxygen due to the large amount of trees there. As there are less trees in the desert, there are less animals. This is why most desert trekkers use an oxygen tank.
Combustion.
It's a natural land barrier so civilizations/empires such as Mali were able to develop without European interference. Also, caravans used to(and still do) cross the desert to trade salt and other goods.
One is market, there are a lot of animals in the desert used as pets. Two is research for military, Nevada and other desert states are used to test bombs etc. Three science research, how animals and other things act to the enviorment. There are a lot more...
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Desert sand is much too fine and contains too much dust and other impurities that prevent it from being used in cement or concrete.
Yes! People that live in the desert often ride trained camels because camels are more used to the desert than, say, animals like horses.
Strawberries!
Being used as a pleasing desert with custard, cream or ice cream