Final answer:
The best word to join the two sentences is 'Even though,' emphasizing the contrast. It helps connect the idea of Jesse's messy backpack to his cleaning action.
Explanation:
Even though would best join the two sentences to show their relationship. For example, 'Even though Jesse's backpack was a mess, he had cleaned it out earlier that day.' This conjunction signifies the contrast between the messy backpack and Jesse's cleaning effort.
Learn more about Conjunctions and sentence structure here:
https://brainly.com/question/38730085
