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: a mutation in the sex cells of a parent can cause a new trait to appear in the parent 's offspring. 
Sentence2: Traits are initiated by mutation and recombination.

SOLUTION: mutation

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

SOLUTION: Sand

PROBLEM: Sentence1: Cells lacking membrane-bound organelles are prokaryotic, and bacteria are prokaryotes. 
Sentence2: Bacteria lack ribosomes.

SOLUTION:
bacteria