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: if a habitat can no longer support animals then those animals will move to another area. 
Sentence2: Each species of animal is unique.

Answer: animals


Question: Sentence1: Heterotrophs get food by eating other living things. 
Sentence2: fish eat other living things.

Answer: living


Question: Sentence1: Gaskets and thermal expansion increase the misalignment problem. 
Sentence2: Increasing heat in gaskets can increase misalignment problems.

Answer:
Gaskets