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: friction causes the temperature of an object to increase. 
Sentence2: internal combustion engines get hot.
answer:
temperature


question:
Sentence1: Ferns are vascular plants. 
Sentence2: when a fern grows, its size of leaves may increase.
answer:
Ferns


question:
Sentence1: Some types of snails are free swimming, while others are sessile. 
Sentence2: lancelet larvae are not sessile.
answer:

sessile