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: drought is when amount of precipitation decreases. 
Sentence2: Drought decreases the availability and abundance of the natural food supply.
[EX A]: drought

[EX Q]: Sentence1: if a habitat can no longer support animals then those animals will move to another area. 
Sentence2: Each species of animal is unique.
[EX A]: animals

[EX Q]: Sentence1: Tides also cause currents. 
Sentence2: the gravitational pull of the Moon on Earth 's oceans causes currents.
[EX A]:
currents