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: Algae have varied life cycles. 
Sentence2: And fish eat algae.

Answer: Algae


Question: Sentence1: Mutations are essential for evolution to occur. 
Sentence2: Genes are altered for evolution to occur.

Answer: evolution


Question: Sentence1: insulated material can be used for keeping warm. 
Sentence2: Coats and blankets are insulating materials that humans wear.

Answer:
insulated