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: Dinosaur bones, like many other artifacts, are fossilized. 
Sentence2: radioactive dating is used to determine the age of dinosaur bones.

SOLUTION: Dinosaur

PROBLEM: Sentence1: if an object is black then that object absorbs all visible light. 
Sentence2: Something is black if it absorbs visible light and doesn't reflect.

SOLUTION: light

PROBLEM: Sentence1: An animal that is a predator gets food by killing and hunting other animals. 
Sentence2: getting food by killing requires seeing prey.

SOLUTION:
food