No mammal can digest cellulose.

Explanation

**Step-by-Step Solution:**

1. **Understand the Statement**: The statement claims that no mammal can digest cellulose. We need to determine if this is true or false.

2. **Define Cellulose**: Cellulose is a complex carbohydrate that forms the main component of the cell walls in plants. It is a significant part of the diet for many animals, especially herbivores.

3. **Identify Mammals that Digest Cellulose**: Herbivorous mammals, such as cows, sheep, and elephants, primarily consume plant material. These animals have specialized digestive systems that allow them to break down cellulose.

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