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 monkeys are mammals. 
Sentence2: monkeys conserve body heat with their hair or fur.

SOLUTION: monkeys

PROBLEM: Sentence1: Babies that are very large or very small at birth are less likely to survive. 
Sentence2: Babies that are very large or very small at birth are less likely to live.

SOLUTION: Babies

PROBLEM: Sentence1: moss causes chemical weathering. 
Sentence2: Sphagnum moss mixed with peat moss.

SOLUTION:
moss