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.
Causes of prostate cancer. It is not known exactly what causes prostate cancer, although a number of things can increase your risk of developing the condition. These include: Age â risk rises as you get older and most cases are diagnosed in men over 50 years of age.