After about 300 a. d., had replaced horses and donkeys as the preferred means of transportation across the sahara.

After about 300 A.D.,camels had replaced horses and donkeys as the preferred means of transportation across the Sahara.

People chose to change the means of transportation due to the benefits that the camels provide. One of the most important is the capacity of these animals to cross large distances without drinking water.

Moreover, camels have the ability to take full advantage of the poor-quality food that is available throughout the desert.

After about 300 AD,camels had replaced horses and donkeys as the preferred means of transportation across the Sahara.

Camels can drink 20 litres of water at once and then survive without water for 7 days.Camels can survive on scarce food of desert.Camel's  flat feet help them walk easily on sinking sand.A big hump of fat on camel's back helps it survive without food for many days.Hair on camel's eyes saves it from sand storm.

#2 the answer is d

#3 the answer is a

#4 the answer is b