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: Heterotrophs are living things that cannot make their own food. 
Sentence2: food contains organic molecules.
[A]: food


[Q]: Sentence1: Bacteria and Viruses Bacteria and viruses can cause diseases. 
Sentence2: bacteria can have a negative impact on an organism.
[A]: Bacteria


[Q]: Sentence1: Fractures A fracture is a break in the bone. 
Sentence2: Breaks in the bone heal when osteoclasts form new bone.
[A]:
bone