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: Complex chemistry is needed to carry out all the functions of life.
Sentence2: Chemistry is primarily concerned with matter, energy, and their interactions.
chemistry

Sentence1: Carbon cycles quickly between organisms and the atmosphere.
Sentence2: the atmosphere is essential to all living organisms.
organisms

Sentence1: X-rays are a form of electromagnetic energy, or radiation.
Sentence2: Electromagnetic energy is used in medical technology.
electromagnetic