Historians have put forward three main hypotheses which clearly contradict each other.

Two main hypotheses have been submitted to explain the effect in terms of an efficient market.

There are two main hypotheses regarding the origin of the rings.

The idea that agriculture spread to Europe, rather than independently developing there, has led to two main hypotheses.

We consider some of the main hypotheses that might account for our findings.

There are two main hypotheses about the process that occurs in the development of the disease.

Her main hypothesis is that for the Indians, drugs took the place of God.

There are five main hypotheses about how to explain the biblical story surrounding Ai in light of archaeological evidence.

There are three main hypotheses about why a pathogen evolves as it does.

There are two main hypotheses about the origin of Scleractinia.