An Admiral of the fleet is a military naval officer of the highest rank. In many nations, the rank is reserved for wartime of ceremonial appointments. It is usually a rank above admiral (which is now usually the highest rank in peace-time for officers in active service) and is often held by the most senior admiral of an entire naval sevice.

the uppermost layer of the skin is called the epidermis. It is the outermost layer of the skin and provides a protective barrier against environmental factors, pathogens, and moisture loss. The epidermis also contains cells responsible for producing melanin, the pigment that gives skin its color, and it constantly renews itself through a process called cell turnover.

The plants that never produce flowers are called "cryptogams." Cryptogams include plants such as ferns, mosses, liverworts, and algae. Unlike flowering plants (angiosperms), which reproduce through seeds enclosed within flowers, cryptogams reproduce through spores and do not produce true flowers. Cryptogams are considered more primitive in evolutionary terms compared to angiosperms, which are the most dominant group of plants on Earth today.

Radiation seed therapy, especially with Cesium-131, is an innovative tool in the fight against cancer.