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: Some mollusks are nearly microscopic. 
Sentence2: Some squids are nearly microscopic.

A: Some
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Q: Sentence1: if fossils of a water animal or plant are found in a place then that place used to be covered by water in the past. 
Sentence2: Fossils of a water animal or plant are located in water-laid sediments.

A: animal
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Q: Sentence1: if a living thing becomes too cold then that living thing will die. 
Sentence2: And without adequate calories, the birds die from the cold.

A:
cold
****