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: Carbon dioxide is controlled by the carbon cycle. 
Sentence2: Carbon dioxide is controled by the carbon circle and is transferred between organisms and atmosphere.

SOLUTION: controlled

PROBLEM: Sentence1: Information on DNA is organized into genes. 
Sentence2: DNA codes for proteins.

SOLUTION: DNA

PROBLEM: Sentence1: Sepals The outermost whorl of modified leaves is called the sepals. 
Sentence2: the outermost whorl of leaves camouflages the bud from possible consumers.

SOLUTION:
leaves