Why do you consider RBC as living cell though it lacks nucleus?

Explanation

### Step-by-Step Solution:

1. **Definition of a Living Cell**: To classify a structure as a living cell, it must meet certain criteria, including having a cell membrane, cytoplasm, and typically a nucleus.

2. **Structure of RBC**: Red blood cells (RBCs) are unique in that they have a biconcave shape and possess a cell membrane known as the "Donant's membrane." They contain cytoplasm but lack a nucleus.

3. **Adaptation of RBCs**: The absence of a nucleus in RBCs is an adaptation that allows them to maximize their primary function, which is the transport of oxygen. By removing the nucleus and other organelles like the endoplasmic reticulum, mitochondria, and Golgi apparatus, RBCs can carry more hemoglobin.

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