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


question:
Sentence1: Angiosperm sporophyte is dominant. 
Sentence2: Flowers form on angiosperms.
answer:
Angiosperm


question:
Sentence1: Coral reefs provide food and shelter to many ocean organisms. 
Sentence2: warm shallow waters provide food and shelter to many ocean organisms.
answer:

food