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: mountains are formed by earthquakes. 
Sentence2: Mountains are formed by moving plates.
[EX A]: are

[EX Q]: Sentence1: Germination depends on the seed coat. 
Sentence2: the force of water causes germination with the emergence of a root.
[EX A]: Germination

[EX Q]: Sentence1: Chloroplasts contain the green pigment chlorophyll. 
Sentence2: animals do not have chlorophyll.
[EX A]:
chlorophyll