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: Diurnal cycles Diurnal cycles are the daily cycles of light and darkness. 
Sentence2: Plants detect and respond to diurnal cycles.
answer:
Diurnal


question:
Sentence1: Endospores are commonly found in soil and water. 
Sentence2: Dirt is really misplaced soil.
answer:
soil


question:
Sentence1: Veins push blood toward the heart. 
Sentence2: deoxygenated blood is carried toward the heart.
answer:

heart