TASK DEFINITION: Generate an overlapping word between the given two sentences. When you find the overlapping words, they don't have to match exactly, e.g., "survival" and "survive" are valid overlapping words. Little words like "the" or "of" don't count! You must generate significant words which are not the stop words.
PROBLEM: Sentence1: All lizards are reptiles. 
Sentence2: Lizards are tetrapod vertebrates that produce amniotic eggs.

SOLUTION: lizards

PROBLEM: Sentence1: Blood is a fluid connective tissue. 
Sentence2: A fluid connective tissue carries oxygen to the brain.

SOLUTION: connective

PROBLEM: Sentence1: Prokaryotes are single-celled organisms that lack a nucleus. 
Sentence2: Prokaryotes have no membrane-bound organelles, thus bacteria are prokaryotic organisms.

SOLUTION:
Prokaryotes