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: Plants use unsaturated fatty acids to store energy. 
Sentence2: Plants and fish contain fatty acids.
[EX A]: Plants

[EX Q]: Sentence1: Insects have 2 antennae. 
Sentence2: Insects have 2 appendages to detect sound.
[EX A]: 2

[EX Q]: Sentence1: Adolescence is the last stage of life before adulthood. 
Sentence2: the last stage of life before adulthood begins with puberty.
[EX A]:
adulthood