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: Mitosis is cell division. 
Sentence2: Chromosomes are the form of the genetic material of a cell during mitosis.
[EX A]: Mitosis

[EX Q]: Sentence1: Insects have 2 antennae. 
Sentence2: Insects have 2 appendages to detect sound.
[EX A]: 2

[EX Q]: Sentence1: Scientists who find and study fossils are called paleontologists. 
Sentence2: Paleontologists study ancient life.
[EX A]:
paleontologists