Where the cancer starts is called the primary tumour. Some types of cancer, called leukaemia, start from blood cells. They don't form solid tumours. Instead, the cancer cells build up in the blood and sometimes the bone marrow. For a cancer to start, certain changes take place within the genes of a cell or a group of cells.
pommel horse. n. 1. A piece of gymnastic equipment that consists of a padded, loaf-shaped object with two pommels on top and stands horizontal to the floor, usually on adjustable legs. 2. An athletic event in which the pommel horse is used.
The biggest horses in the world are draft breeds. These horses were bred to pull or carry large loads. Included in the draft breeds are the Shire, Percheron and Clydesdale. Before the use of trucks and tractors, draft horses pulled ploughs, wagons, street cars, barges and other farm implements and conveyances. Smallest Type of Equine. The smallest horses in the world are ponies. There are several breeds specifically developed for their diminutive size. Ponies are hardy, and they tend to be longer lived than their larger brethren.