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.

Sentence1: if an animal sweats then that animal 's bodily water decreases. 
Sentence2: When an animal regulates their body temperature by releasing water, their bodily water decreases.
bodily

Sentence1: Apollo 13 spacecraft is launched. 
Sentence2: Propulsion was used for flying Apollo 13.
13

Sentence1: Digestion is the process of breaking down food into components the body can absorb. 
Sentence2: Food is digested and absorbed in the small intestine.

Digestion