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: All cells share some of the same structures and basic functions. 
Sentence2: Inside the cell is a structure called the nucleus.

Answer: cells


Question: Sentence1: mountains are formed by earthquakes. 
Sentence2: Mountains are formed by moving plates.

Answer: are


Question: Sentence1: Oxygen is essential for cellular respiration for all aerobic organisms. 
Sentence2: Fungi are aerobic organisms.

Answer:
aerobic