Question

add commas, semicolons, or colons if needed. otherwise, submit the text without any additional punctuation. zinc is a trace element found in the pancreas, where it may help store insulin in the gastrointestinal tract, where its a part of enzymes that digest protein and in red blood cells.

Explanation:

The sentence lists three locations where zinc is found: the pancreas, the gastrointestinal tract, and red blood cells. Commas are used to separate items in a list. The original sentence already has commas after "pancreas" and "protein" which are correct for separating the clauses and items in the list.

Answer:

Zinc is a trace element found in the pancreas, where it may help store insulin, in the gastrointestinal tract, where it's a part of enzymes that digest protein, and in red blood cells.