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: creating paper requires cutting down trees. 
Sentence2: Trees begin as epiphytes on host trees.

SOLUTION: trees

PROBLEM: Sentence1: if an animal sweats then that animal 's bodily water decreases. 
Sentence2: When an animal regulates their body temperature by releasing water, their bodily water decreases.

SOLUTION: bodily

PROBLEM: Sentence1: Earth orbiting the Sun causes seasons to change. 
Sentence2: Earth orbiting the sun causes weather changes.

SOLUTION:
Earth