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: Refraction is the bending of light. 
Sentence2: a rainbow is formed by bending of light by separating light into all different colors.
answer:
bending


question:
Sentence1: Dromaeosaurs are part of the theropod group of dinosaurs. 
Sentence2: Birds evolved from a group of bipedal dinosaurs that included Dromaeosaurs.
answer:
Dromaeosaurs


question:
Sentence1: bacteria in soil convert atmospheric nitrogen into a form usable by plants. 
Sentence2: Bacteria in dirt helps plants get vitamins to grow.
answer:

bacteria