Are the following Physical or chemical changes?

_____a.The teeth tear off a bite of pizza.

_____b.The starch in the pizza crust turns to sugar.

_____c.Muscles squeeze the chewed pizza down your esophagus.

_____d.In the intestines, liquids from the kidneys and pancreas mix with leftovers from the

stomach.

_____e.Water is recycled back into your body.