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.

[EX Q]: Sentence1: intense heat has a negative impact on an organism. 
Sentence2: intense heat has a negative impact on plants.
[EX A]: heat

[EX Q]: Sentence1: if fossils of an animal or plant are found in a place then that animal or plant used to live in that place. 
Sentence2: Fossils are preserved original remains or preserved evidence of plants and animals.
[EX A]: fossils

[EX Q]: Sentence1: Energy enters ecosystems in the form of sunlight or chemical compounds. 
Sentence2: Nature is comprised of many ecosystems which all depend upon energy.
[EX A]:
Energy