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: exercise increases a body 's strength. 
Sentence2: Exercise is more than running and lifting.
exercise

Sentence1: Mammals conserve body heat with their hair or fur. 
Sentence2: Heat is emitted energy.

heat