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: Carbon dioxide is controlled by the carbon cycle. 
Sentence2: Carbon dioxide is controled by the carbon circle and is transferred between organisms and atmosphere.

A: controlled
****
Q: Sentence1: Some mollusks are nearly microscopic. 
Sentence2: Some squids are nearly microscopic.

A: Some
****
Q: Sentence1: a long tail can be used to move through water by an animal. 
Sentence2: Sharks move through the water with their tail.

A:
move
****