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.

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

A: Angiosperm
****
Q: Sentence1: if fossils of an animal or plant are found in a place then that animal or plant used to live in that place. 
Sentence2: Fossils are preserved original remains or preserved evidence of plants and animals.

A: fossils
****
Q: Sentence1: Dolphins are an aquatic mammal closely related to whales and porpoises. 
Sentence2: Dolphins require great amounts of water to survive.

A:
Dolphins
****