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.

Q: Sentence1: Leaves make food for the plant. 
Sentence2: Some producers have leaves to help use energy and inorganic molecules.

A: Leaves
****
Q: Sentence1: Sand and mud are examples of sediments. 
Sentence2: layers of sand over the remains of organisms over time can create fossils.

A: Sand
****
Q: Sentence1: Cancer is a disease that occurs when the cell cycle is no longer regulated. 
Sentence2: a disease that can be metastic occurs when the cell cycle is no longer regulated.

A:
cell
****