Adaptation in living organisms is an attribute which allows it to better live in its habitat. It can be

Options

A. Morphological
B. Physiological
C. Behavioural
D. All of these

Answer

### Step-by-Step Solution:

1. **Understanding Adaptation**: Adaptation refers to the characteristics or traits that enable living organisms to survive and thrive in their specific environments. These adaptations can be structural, physiological, or behavioral.

2. **Types of Adaptations**:
- **Morphological Adaptations**: These are physical changes in the structure of organisms. For example, desert plants have adapted to their environment by reducing their leaves to spines to minimize water loss through transpiration. This adaptation helps them conserve water in arid conditions.

- **Physiological Adaptations**: These involve internal body processes. An example is altitude sickness in humans. At high altitudes, the oxygen pressure is lower, so the body compensates by increasing the production of red blood cells (RBCs) and altering the binding affinity of hemoglobin to oxygen. This allows for better oxygen delivery despite the lower availability of oxygen.

- **Behavioral Adaptations**: These are changes in behavior that help an organism survive. For instance, desert lizards bask in the sun to absorb heat and then retreat to their burrows to avoid extreme temperatures. This behavior helps them regulate their body temperature and survive in harsh conditions.

3. **Conclusion**: Adaptation can be classified into three main types: morphological, physiological, and behavioral. Each type plays a crucial role in helping organisms survive in their respective habitats.

4. **Final Answer**: Therefore, the correct answer to the question is that adaptation in living organisms can be of three types: morphological, physiological, and behavioral.