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: moss causes chemical weathering. 
Sentence2: If the moss was completely dried then it is dead.

SOLUTION: moss

PROBLEM: Sentence1: a mutation in the sex cells of a parent can cause a new trait to appear in the parent 's offspring. 
Sentence2: cancer of a parent's cells can cause a new trait to appear in their offspring.

SOLUTION: appear

PROBLEM: Sentence1: Bone provides protection for soft tissues and internal organs. 
Sentence2: Bone matrix consists of collagen and minerals.

SOLUTION:
Bone