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: moss causes chemical weathering. 
Sentence2: If the moss was completely dried then it is dead.

A: moss
****
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: Insects have chemical receptors on their antennae, legs or feet. 
Sentence2: insects detect chemicals with their feet.

A:
feet
****