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: Roundworms make up the phylum Nematoda. 
Sentence2: Also, nematoda and rotifera are important groups contributing to soils.

SOLUTION: Nematoda

PROBLEM: Sentence1: Heat energy is measured in calories. 
Sentence2: condensing means changing from a gas into a liquid by reducing something that is measured in calories.

SOLUTION:
calories