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: Aquatic animals are adapted to living within certain salinity ranges. 
Sentence2: Animals adapted to living within certain salinity ranges require great amounts of water to survive.
[EX A]: adapted

[EX Q]: Sentence1: creating paper requires cutting down trees. 
Sentence2: Rainforests are destroyed by logging and all of the trees are cut down.
[EX A]: cutting

[EX Q]: Sentence1: Lipids may consist of fatty acids alone, or they may contain other molecules as well. 
Sentence2: Carbon, oxygen, and hydrogen can be combined with fatty acids.
[EX A]:
acids