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: Osteoporosis is a disease in which osteoclasts are more active than osteoblasts. 
Sentence2: a thinning and weakening of bone is a disease in which osteoclasts are more active than osteoblasts.
answer:
active


question:
Sentence1: DNA is made up of nucleotides. 
Sentence2: Mutations can change the structure of DNA.
answer:
DNA


question:
Sentence1: Phytoplankton are bacteria and algae that use sunlight to make food. 
Sentence2: most copepods feed on bacteria and algae that use sunlight to make food.
answer:

algae