instruction:
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.
question:
Sentence1: smell is used for finding food by some animals. 
Sentence2: Food includes small rodents and birds.
answer:
food


question:
Sentence1: Ejaculation allows males to reproduce. 
Sentence2: propelling sperm from the epididymes allows males to reproduce.
answer:
allows


question:
Sentence1: camouflage is used for protection by prey against predators. 
Sentence2: blending is used for protection.
answer:

protection