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: After a seed is planted it is watered. 
Sentence2: seeds need water.
[EX A]: seed

[EX Q]: Sentence1: a wildfire changes an ecosystem drastically. 
Sentence2: Forest fires change an ecosystem drastically.
[EX A]: changes

[EX Q]: Sentence1: Playing is just one of many ways that mammals and other animals learn how to behave. 
Sentence2: Playing is one of many ways animal improve ability to survive and thrive.
[EX A]:
Playing