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: Many plants respond to the days growing shorter in the fall by going dormant. 
Sentence2: Many plants respond to the autumnal equinox by going dormant.

A: Many
****
Q: Sentence1: After a seed is planted it is watered. 
Sentence2: seeds need water.

A: seed
****
Q: Sentence1: intense heat has a negative impact on an organism. 
Sentence2: Exercise, fever, and heat cause the body's temperature to rise.

A:
organism
****