RBCs are biconcave in shape and do not possess nucleus. How are these characteristics helpful in metabolism?

Explanation

**Step-by-Step Solution:**

1. **Understanding the Structure of RBCs:**
- Red blood cells (RBCs) are characterized by their biconcave shape and the absence of a nucleus. The biconcave shape means that the cells are thinner in the center and thicker at the edges, resembling a doughnut without a hole.

2. **Importance of Biconcave Shape:**
- The biconcave shape increases the surface area of the RBCs. This larger surface area is crucial for gas exchange, allowing more oxygen to be absorbed and more carbon dioxide to be released efficiently.

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