Q: - Food leaves the esophagus and enters the stomach - The stomach churns the food - With the aid of stomach acids - The food becomes a thick liquid What might be the last step of the process?
A: Is then passed to the small intestine.

Q: - People breathe and expel carbon dioxide - Engines produce carbon dioxide - Living things produce waste - Waste decomposes - Decomposition produces methane - Water evaporates - Water vapor joins the atmosphere What might be the last step of the process?
A: Carbon dioxide, water vapor and methane are greenhouse gases

Q: - Warm weather causes water to evaporate - The water rises up in the air - It starts to cools down - The water starts to condense - It forms into clouds What might be the last step of the process?
A: When there is enough moisture in the clouds it starts to rain.

Q: - A person takes in oxygen through their nose or mouth - The oxygen travels into the body - Breaks down into glucose - Carbon dioxide is produced by the glucose breakdown What might be the last step of the process?
A:
The carbon dioxide is exhaled out of the body through the nose or mouth.