In response to this evidence, many new theories have been proposed.

He is best known for proposing a theory of natural selection.

Several theories have been proposed to account for this behavior.

Two common theories were proposed to account for these effects.

Second, it proposed a theory to explain how evolution works.

Several theories were proposed as to how the area and the Palace received its name.

Many theories as to how world peace could be achieved have been proposed.

Two main theories have been proposed to explain the development of the disorder.

In response to Said's argument, several alternative theories were proposed.

Several theories have been proposed as to the way that such associations hold rights.