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.

[EX Q]: Sentence1: Male dogs use pheromones in urine to mark their territory. 
Sentence2: Pheromones are hormones that are thought to stimulate, through smell, sexual reactions in animals.
[EX A]: pheromones

[EX Q]: Sentence1: An example of a cartilaginous fish is a shark. 
Sentence2: jaws make sharks excellent predators.
[EX A]: shark

[EX Q]: Sentence1: Arteries generally carry oxygen-rich blood. 
Sentence2: Bright red fluid blood is the exception, but has been recorded.
[EX A]:
blood