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: Chordates have a complete digestive system and a closed circulatory system. 
Sentence2: animals with jaws have a complete digestive system and a closed circulatory system.
answer:
circulatory


question:
Sentence1: Veins generally carry deoxygenated blood. 
Sentence2: Blood carries blood cells.
answer:
blood


question:
Sentence1: Viruses are not cells. 
Sentence2: Viruses are not tissue.
answer:

Viruses