  Although the terms ocean and sea are often used interchangeably, a sea is generally considered to be smaller than an ocean. One definition of ocean is: a great bod â¦ y of interconnecting salt water that covers 71 percent of the Earth's surface.
Sharpie brand permanent markers. A permanent marker or indelible marker is a type of marker pen that is used to create permanent writing on an object. In general, the ink comprises a main carrier solvent, a glyceride, a pyrrolidone, a resin and a colorant, making it waterproof.
1 CEA (carcinoembryonic antigen): a marker for the presence of colon, lung, and liver cancers. This marker may be used to determine if the breast cancer has traveled to other areas of the body.  Circulating tumor cells: cells that break off from the cancer and move into the blood stream.