Answer the following question given this paragraph: 

Break down some substances in food that cannot be digested, such as fiber and some starches and sugars. Bacteria produce enzymes that digest carbohydrates in plant cell walls. Most of the nutritional value of plant material would be wasted without these bacteria. These help us digest plant foods like spinach.


Q: What produces enzymes that digest carbohydrates in plant cell walls?

 Choices:

- pollen

- protists

- algae

- bacteria

A:
bacteria
