Freebase(0.00 / 0 votes)Rate this definition: Arbol is a programming language which has been primarily developed for use in Genetic Programming experiments. It is a functional programming language inspired by the ideas of other small and esoteric languages.
Causes. In most cases of colon or rectal cancers, the cause or causes are unknown. Defects in genes that normally protect against cancer play the major role in causing polyp cells to continuously change and become cancerous.
Doctors donât know what triggers scleroderma. Itâs one of a group of conditions known as autoimmune diseases. These happen when your immune system, which usually protects you from germs, turns on your body and causes inflammation of skin and other organs. The symptoms can affect many parts of your body.