They believed the heart was the center of a person's being and intelligence. A traditional walrus haul-out or resting area is called an uglit. An entomologist is a scientist who studies insects. Cancer is a group of diseases that occur when cells become abnormal and divide without control or order. Each organ in the body is made up of various kinds of cells.
Cells normally divide in an orderly way to produce more cells only when they are needed.
This process helps keep the body healthy. If cells divide when new cells are not needed, they form too much tissue. This extra tissue is called a tumor, and can be benign or malignant. A form of vetch called horse bean or broad bean is grown for its seed, which is eaten as a vegetable. Vetch is also used as fertilizer.