instruction:
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.
question:
Sentence1: Chemical weathering is the chemical disintigration of rocks. 
Sentence2: moss causes the chemical disintigration of rocks.
answer:
chemical


question:
Sentence1: ultraviolet light causes sunburn. 
Sentence2: Sunburn risk is higher at elevation.
answer:
sunburn


question:
Sentence1: Producers use energy and inorganic molecules to make food. 
Sentence2: Producers use energy and inorganic molecules for the retention of nutrients.
answer:

Producers