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: Specialization occurs when competing species evolve different adaptations. 
Sentence2: evolving different adaptations increases survival.
[EX A]: adaptations

[EX Q]: Sentence1: Antigens are proteins foreign to the body. 
Sentence2: antigens are proteins.
[EX A]: proteins

[EX Q]: Sentence1: Fungi spores can develop into new haploid individuals without being fertilized. 
Sentence2: fungi are multicellular.
[EX A]:
Fungi