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.

[EX Q]: Sentence1: Minerals are chemical elements that are essential for body processes. 
Sentence2: minerals are needed by body processes.
[EX A]: processes

[EX Q]: Sentence1: if a neutral atom loses an electron then an atom with a negative charge will be formed. 
Sentence2: Ice crystals that are formed have a negative charge.
[EX A]: charge

[EX Q]: Sentence1: Sponges have specialized cells called collar cells. 
Sentence2: Flagellum of collar cell cause current to pass over collar and food is collected.
[EX A]:
cells