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

Sentence1: Ribosomes are small organelles where proteins are made. 
Sentence2: Ribosomes are assembled inside the nucleus.
Ribosomes

Sentence1: Mammals breathe with the help of a diaphragm. 
Sentence2: Mammals breathe with the help of a muscle below the lungs.

Mammals