The palm tree is one of the oldest trees linked to the life of the people of the Arabian Peninsula. It can stand high heat, salty soil and a lack of water. A palm starts to give fruit a few years after it is planted, and it can live for many decades. Palm trees give fruit of many kinds, which differ in taste, size and color. Some well-known kinds are Sukkari, Khalas and Ajwa. The use of the palm is not limited to dates. People use the stalks of the leaves to make roofs and beds. They use the fiber to make ropes. They use the leaves to make baskets and mats. Dates were a main food for travelers because they give the body quick energy and keep for a long time without spoiling. For this reason, the palm kept a special place in Arab culture.

Question: We can infer that dates suit long journeys because they: