Final answer:
The most suitable transition word cannot be determined without context; however, the meaning of 'hypothesis' aligns closest with 'suggestion'. Transition words are crucial for clear writing and vary based on the relationship they indicate between ideas.
Step-by-step explanation:
Choosing the correct transition word depends on the relationship between the ideas in the sentences. If the message in sentence 15 contradicts the previous sentence, 'However' would be appropriate. If it adds to the previous idea, 'Furthermore' is suitable. If sentence 15 shows a comparison, 'Similarly' or 'Likewise' can be used. The correct answer also depends on the content preceding the underlined portion. Without additional context, it's impossible to determine the most logical transition.
For the second question, the word 'hypothesis' is closest in meaning to 'suggestion' among the given options because a hypothesis is a proposed explanation made on the basis of limited evidence as a starting point for further investigation, which is not yet confirmed as factual or law.
Knowing how to use transition words effectively is essential for clear communication. 'Compare and contrast' words signal similarities or differences; 'Detail' words introduce specific information; 'Emphasis or clarification' words give importance or explain; and 'Example' words illustrate a point with specific instances.