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: intense heat has a negative impact on an organism. 
Sentence2: intense heat has a negative impact on plants.

SOLUTION: heat

PROBLEM: Sentence1: Competition may lead to aggressive behaviors or displays of aggression. 
Sentence2: Aggression Aggression and violence often go together.

SOLUTION: aggression

PROBLEM: Sentence1: Hormones are produced and released by the endocrine system . 
Sentence2: the endocrine system releases chemical messengers that control many body functions.

SOLUTION:
endocrine