Final answer:
The thesis statement, typically the last sentence of the essay's introduction, outlines the essay's main argument and is supported by topic sentences in body paragraphs. Transitions are used between paragraphs to maintain focus on the thesis.
Step-by-step explanation:
The sentence that introduces the paragraph and its thesis statement in an essay is typically the last sentence in the introduction. This thesis statement articulates the main argument of the essay and outlines the points that will be addressed in the body paragraphs. An effective thesis should be short, specific, debatable, and clear. It introduces the issue at hand and asserts the writer's stance on the topic. Moreover, most paragraphs should have topic sentences that reflect the purpose stated in the thesis, providing a strong foundation for analyzing the subject matter.
The use of transitions between paragraphs is another important element in essay structure. These transitions help connect the paragraphs and maintain the focus on the thesis statement. Claims throughout the essay should be well-supported with evidence, either through quotations or paraphrasing, to present the information clearly and logically.