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: Most bryophytes are small. 
Sentence2: Most in the same group as mosses are small.
answer:
small


question:
Sentence1: gills are used for breathing water by aquatic animals. 
Sentence2: gills are used for breathing water by sharks.
answer:
are


question:
Sentence1: Lead compounds are marine pollutants. 
Sentence2: Eating something that contains lead has a negative impact on an organism 's survival.
answer:

Lead