TASK DEFINITION: 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.
PROBLEM: Sentence1: Insects have 2 antennae. 
Sentence2: Insects have 2 appendages to detect sound.

SOLUTION: 2

PROBLEM: Sentence1: Cnidarians have a hydrostatic skeleton. 
Sentence2: Jellyfish have a hydrostatic skeleton.

SOLUTION: hydrostatic

PROBLEM: Sentence1: gases released during the use of fossil fuels causes global warming. 
Sentence2: Gases released during the use of fossil fuels threaten the entire planet.

SOLUTION:
during