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: Some mollusks are nearly microscopic. 
Sentence2: Some squids are nearly microscopic.
[EX A]: Some

[EX Q]: Sentence1: Earthquakes are natural disasters. 
Sentence2: earthquakes can cause animals to leave an environment.
[EX A]: Earthquakes

[EX Q]: Sentence1: Finally, the veins carry the blood back to the heart. 
Sentence2: blood traveling to the heart is deoxygenated.
[EX A]:
heart