Give one structural difference between chlorophylla and chlorophyll b.

Explanation

To answer the question regarding the structural difference between chlorophyll a and chlorophyll b, we can break down the information as follows:

### Step-by-Step Solution:

1. **Identify the Pigments**: Recognize that chlorophyll a and chlorophyll b are both types of chlorophyll, which are pigments essential for photosynthesis in plants.

2. **Understand Their Roles**: Chlorophyll a is the primary pigment involved in photosynthesis, while chlorophyll b serves as an accessory pigment, helping to capture additional light energy.

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