Explanation:

- Physiological Adaptation: This involves changes in an organism's internal processes to better suit its environment. For example, camels retain water efficiently to survive in the desert.

- Emotional Adaptation: This is not recognized as a biological form of adaptation. Biological adaptations usually involve physical or behavioral changes rather than emotional.

- Behavioural Adaptation: This includes changes in an organism's behavior that enhance survival and reproduction. For example, birds migrating to warmer areas during winter.

- Morphological Adaptation: This pertains to changes in the structure or form of an organism to improve its survival chances. An example is the thick fur of polar bears.

- Correct Answer: Option 2 - Emotional