Which polysaccharide is associated with animal organisms?

Explanation

**Step-by-Step Solution:**

1. **Understanding Polysaccharides**: Polysaccharides are large molecules made up of many monosaccharide units. They serve various functions in living organisms, including energy storage and structural support.

2. **Identifying Polysaccharides in Animals**: In animals, the primary polysaccharide involved in energy storage is glycogen.

3. **Glycogen's Role**: Glycogen acts as a stored form of glucose (sugar) in animals. It is primarily found in the liver and muscle tissues, where it can be quickly mobilized to meet energy needs.

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