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: Flowers produce seeds for reproduction. 
Sentence2: flowers require dispersal for reproduction.
answer:
Flowers


question:
Sentence1: Cultivation is easier if soil is loose. 
Sentence2: soil with more oxygen is easier to cultivate.
answer:
Cultivation


question:
Sentence1: Pneumonia may be caused by an infection or injury of the lungs. 
Sentence2: Opportunistic infections may be a result of an infection or injury of the lungs.
answer:

infection