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: an animal usually requires a warm body temperature for survival. 
Sentence2: Warm blooded animals have a constant body temperature.
answer:
animal


question:
Sentence1: if an object is made of a material then that object has the properties of that material. 
Sentence2: If an object is made of a drug, then that object has the properties of that drug.
answer:
made


question:
Sentence1: volcanic ash in the atmosphere decreases the temperature by blocking the sun. 
Sentence2: volcanic ash in the atmosphere can have major effects on natural ecosystems.
answer:

ash