Are the following Physical or Chemical changes?

1. The teeth tear off a bite of pizza: ______

2. The starch in the pizza crust turns to sugar: ______

3. Muscles squeeze the chewed pizza down your esophagus: ________

4. In the intestines, liquids from the kidneys and pancreas mix with leftovers from the stomach: _______

5. Water is recycled back into your body: ______