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.

Q: Sentence1: a thermometer is used to measure temperature. 
Sentence2: a thermometer is used to measure heat.

A: a
****
Q: Sentence1: Specialization decreases mortality 12,13 and increases survival. 
Sentence2: evolving different adaptations increases survival.

A: increases
****
Q: Sentence1: Salinity is vital for animals that live in the ocean. 
Sentence2: Coral reefs provide food and shelter to animals that require salinity.

A:
Salinity
****
