Theory is a singular noun = 1 theory
Theories is a plural noun = more than one theory
No, there are no other theories but the theory of evolution by natural selection that explain so much about evolution.
The major stage theories are the Psychoanalytic theory, behaviorism theory and Cognitive theory.
The plural form of theory is theories.
*Plate tectonic theory *continental drift theory *convection theory *expansion theory theories of diastrophism and diastrophic movements of the earth have the same meaning
Scientists have proposed several theories of man's origin. Some of these theories are: the Creationist theory, the missing links theory and the out of Africa theory.
criminological theory
The five theories of the state are the Pluralist theory, the Elite theory, the Marxist theory, the Functionalist theory, and the Systems theory. Each of these theories offers a different perspective on how power is distributed and how the state functions within a society.
Yes. They are the same theories as for all electromagnetic radiation.
Ancient Greeks had two major theories of matter. These were the Atomic theory of matter and the theory of pangenesis.
The plural form of the noun theory is theories.The plural possessive form is theories'.example: All of his theories' validity is questionable.
The four theories of prejudice are realistic conflict theory, social identity theory, authoritarian personality theory, and intergroup contact theory. These theories help to explain the origins and perpetuation of prejudice within society.
The average person forms theories with little if any intellectual rigor or scientific investigation, hence, those theories are often not valid.