Given what we know, we can confirm that though the options listed are all correct, the stomach should also be listed as a mechanical digestive system since it is both.
Why is the stomach mechanical and chemical?
The stomach is considered as both a mechanical digestive system as well as a chemical system. This has to do with the fact that the stomach uses muscles to move and pass along the food it is digesting, making it a mechanical digestive system, while also using powerful enzymes and acids to break down the food, granting it status as a chemical digestive system.
Therefore, we can confirm that the only incorrect aspect of this question is that the stomach is only listed as chemical, when in fact it should be listed as both chemical and mechanical.
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