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.
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Question: Sentence1: when a hemisphere is tilted away from the sun , that hemisphere receives less direct sunlight. 
Sentence2: Sunlight is delivered in small packets of energy called photons.

Answer: sunlight


Question: Sentence1: Fractures heal when osteoclasts form new bone. 
Sentence2: Fractures A fracture is a broken or cracked bone.

Answer: Fractures


Question: Sentence1: Photosynthesis is the chemical change that produces food and oxygen in green plants. 
Sentence2: green plants convert carbon dioxide, water, and solar energy into carbohydrates for themselves.

Answer:
green