what is the plural form of thesis

The plural of ‘thesis’ is ‘theses.’ The word ‘thesis’ is singular. To make it plural, you change the ‘-is’ at the end to ‘-es’.
Try it risk-free for 30 days

By using the singular as the section header, you would be naming that section due to the act of making conclusion. Where the act of making conclusion could consist of many conclusions or a conclusion with a number of corollaries.
Does that mean when using conclusions , there are more than one finding in the article?

References:

http://english.stackexchange.com/questions/102818/when-to-use-conclusion-and-conclusions-in-a-scientific-article-or-report
http://study.com/academy/answer/what-is-the-plural-of-thesis.html