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.

[Q]: Sentence1: a solution is formed by one substance being dissolved in another substance. 
Sentence2: A solution is formed when limestone is dissolved in ocean water.
[A]: formed


[Q]: Sentence1: camouflage is used for protection by prey against predators. 
Sentence2: blending is used for protection.
[A]: protection


[Q]: Sentence1: Once sperm is deposited in the vagina , it travels through the cervix and into the Fallopian tubes. 
Sentence2: Sperm travels through the cervix and into the Fallopian tubes after sexual intercourse.
[A]:
Fallopian