Unique
An item or object that is the only one of its kind is referred to as a "unique" or "one-of-a-kind."
A substance that is composed of only one kind of matter is called an element. The smallest particle of an element is called an atom.
Homogenous
A substance that only contains one kind of atom is called an element.
A material made up of only one kind of matter is called a pure substance. It has a uniform composition and specific properties.
Material made up of only one kind of matter is called an Element
The smallest grouping that only contains one kind of organism is called a species. Each species consists of individuals that are capable of interbreeding and producing fertile offspring.
element
Because it is made out of only one kind of element (called neon).
pure substace
A substance that contains only one type of element is referred to as 'intrinsic.' An example being 'Intrinsic Silicon,' used in the production of semi-conductors.
well i don't know why the only one is called Development. ---- If the only server you are seeing is one called development, that means the servers are down for maintenance of some kind, be it weekly maintenance or emergency maintenance.