Give scientific reasons: Lymph is a colourless fluid.

Explanation

**Step-by-Step Solution:**

1. **Definition of Lymph**: Lymph is a fluid that circulates in the lymphatic system, which is part of the immune system in the body.

2. **Composition of Lymph**: Unlike blood, lymph does not contain red blood cells (RBCs). Red blood cells are responsible for the red color of blood due to the presence of hemoglobin.

3. **Role of Hemoglobin**: Hemoglobin is a protein found in red blood cells that binds to oxygen and gives blood its red color. Since lymph lacks red blood cells, it also lacks hemoglobin.

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