TASK DEFINITION: In this task, you're given a pair of sentences, sentence 1 and sentence 2. Your job is to determine if the two sentences clearly agree/disagree with each other, or if this can't be determined. Indicate your answer as yes or no respectively.
PROBLEM: Sentence 1: The fruit and leaves feed crabs whose waste products in turn feed fish, prawns, and mollusks. Sentence 2: Without the crabs' waste, fish, mollusks, and prawns wouldn't have as much food.

SOLUTION: no

PROBLEM: Sentence 1: But Dave Hanson's at least five inches shorter and fifty pounds lighter, too. Sentence 2: Dave Hanson is larger than everyone. 

SOLUTION: yes

PROBLEM: Sentence 1: There he established a school of navigation that attracted astronomers, cartographers, and other leading scientists of the day. Sentence 2: He had no interest in education.

SOLUTION:
yes