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: Cell death occurs by activation of cell death genes. 
Sentence2: Aging is associated with the activation of certain genes.
answer:
activation


question:
Sentence1: if humans disturb animals in a location then those animals will move to a different location. 
Sentence2: The human being is self-aware.
answer:
humans


question:
Sentence1: Sight is the ability to sense light, and the eye is the organ that senses light. 
Sentence2: sight is the ability to sense rays or beams, and the eye is the organ that senses them.
answer:

Sight