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

SOLUTION: evolution

PROBLEM: Sentence1: Fission is a type of reproduction, but a baby is the result of sexual reproduction. 
Sentence2: the fallopian tubes are used to make babies.

SOLUTION: baby

PROBLEM: Sentence1: Endospore-forming bacteria produce a unique resting cell called an endospore . 
Sentence2: Bacterial resting cells are often found in soil and water.

SOLUTION:
bacteria