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: Interestingly, a squid is also a mollusk. 
Sentence2: squids have a circulatory system with one or two hearts that pump blood.

A: squid
****
Q: Sentence1: Heterotrophs get food by eating other living things. 
Sentence2: fish eat other living things.

A: living
****
Q: Sentence1: unequal heating of Earth 's surface by the Sun causes global wind patterns. 
Sentence2: Differences in solar warming with latitude during the day on the Earth's surface influence global wind patterns.

A:
global
****