instruction:
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.
question:
Sentence1: Habitat destruction is the primary cause of extinction or threat of extinction for all animals. 
Sentence2: building housing developments may cause extinction.
answer:
extinction


question:
Sentence1: Light is the visible form of electromagnetic energy. 
Sentence2: Electromagnetic energy enters the eye through an opening called the pupil.
answer:
electromagnetic


question:
Sentence1: if heat is conducted to an object then that object will become hot. 
Sentence2: Because the surface of the ocean is heated by sunlight, the depths are cooler.
answer:

heat