The phrase "are composed of various components" is correct and usable in written English.
It can be used when describing the makeup or structure of something, indicating that it consists of different parts or elements.
Example: "The machine's functionality is complex, as it are composed of various components that work together seamlessly."
Alternatives: "are made up of different elements" or "consist of multiple parts."
The natural gas condensates are composed of various components of hydrocarbons and some contaminants such as hydrogen sulfide, thiols (mercaptans), and aromatics.
A great deal of effort has been invested to improve the performance and efficiency of mechanical systems which are composed of various components.
Traditional herbal medicines are composed of various components.
The standard deviation of the polyp group is relatively large because the polyp tissues are composed of various components including normal mucosal tissues, adenoma tissues, inflammation tissues, and malignant tissues.
GNUnet is composed of various components that run in separate operating system processes and communicate via message passing.
This evaluation model is applicable to products whose appearance is composed of various components, and subsequent researchers or designers may apply this method to a variety of design cases.
Similar to serum, seminal plasma is composed of various components, and each of them has physiological significance.
Modern vehicles are composed of various electronic components like: electric ignition, motors to drive different pumps (oil, water or fuel) or fans, other sub-systems like communication sub-systems (radio receiver/transmitters), microprocessors, sensors, entertainment facilities and wires that route the signals among the electronic sub-systems.
Because the PHVs are composed of various radiopaque components such as a titanium ring and tungsten impregnated leaflets, which have CT densities higher than 800 HU [ 12], the 175-HU threshold included the radiopaque components of the PHV.
Most cosmetic and pharmaceutical liposomes are composed of various types of lecithins of natural, semi-synthetic, and synthetic origins; the major component is usually phosphatidylcholine (PC).
