Answer:
A thesis expresses a viewpoint about a topic.
Step-by-step explanation:
One thesis the beginning of an argumentative text, an affirmation whose veracity has been argued, demonstrated or justified in some way. Generally it states a scientific proposition, an axiom or a demonstrable fact.
Derived from the scientific method, a thesis is the concrete affirmation of an idea that is exposed in an open and substantiated way. It can also be called scientific theory, since a theoretical support can be considered part of established knowledge. Normally, in an argumentative text, the opinion that the writer has about the subject he / she is talking about is conformed. After that the writer defends his thesis with arguments.