1) What themes or messages does Sinclair communicate to reader about the topics he writes about?

Sinclair presented his ideas by writing on the themes of oppression, capitalism, poverty, and socialism.

Explanation:

Upton Sinclair was a renowned American writer of his time who wrote almost 100 books in different genres. Of all his work, Sinclair most famous 'The Jungle' was something where he exposed the poor conditions in the US meatpacking industry. Apart from this, in his another book 'The Brass Check', Sinclair exposed an American journalism for illegally presenting news without any proper research.

Sinclair always made sure to present before his readers the harsh realities of the happenings in US. Be it poverty or capitalism or oppression or anything, exposing wrong people involved in wrong doings was something he always wrote about.

(i can't select because there is no options but, i will answer) using evidence effectively. most of the assignments you will do in university will ask you to make an argument, to take a stance, or to prove a hypothesis. the best way to do this is to research the topic, develop a thesis statement, hypothesis, or claim and then use evidence to support this claim.