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: Female monotremes lack a uterus and vagina. 
Sentence2: Babies are normally delivered from the uterus through the vagina.
[EX A]: uterus

[EX Q]: Sentence1: Most bryophytes are small. 
Sentence2: Most in the same group as mosses are small.
[EX A]: small

[EX Q]: Sentence1: DNA contains genetic instructions for proteins, and RNA helps assemble the proteins. 
Sentence2: RNA hybrids are then detected by a luminometer.
[EX A]:
RNA