Given scientific fact as input, generate the question from this fact such that it can be answered from the input.

Input: Consider Input: Gastric emptying is regulated by both the stomach and the duodenum.

Output: Gastric emptying is regulated by both the stomach and what other digestive structure?


Input: Consider Input: Virtually all aquatic organisms depend directly or indirectly on protists for food.

Output: Virtually all aquatic organisms depend directly or indirectly on what for food?


Input: Consider Input: Our global ecological footprint depends on resource use per person and population density population factor.
Output: Our global ecological footprint depends on resource use per person and what population factor?