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: Some pelycosaurs gave rise to a group of animals called therapsids. 
Sentence2: Like most other groups of synapsids, all pelycosaurs are now extinct.

SOLUTION: pelycosaurs

PROBLEM: Sentence1: looking at bright objects has a negative impact on the eyes. 
Sentence2: Looking at bright objects have a negative impact on the retina.

SOLUTION: bright

PROBLEM: Sentence1: Lipids Lipids are diverse hydrophobic molecules. 
Sentence2: Steroid hormones are made of diverse hydrophobic molecules.

SOLUTION:
diverse