$A$ healthy animal feeds regularly and has an abnormal posture.

Why do some children fall ill more frequently than others living in the same locality?

Which one of the following is not important for individual health?

Health is not merely the absence of disease. How can we define health? Classify diseases on the basis of:
$(i)$ Duration of the diseases:
$(ii)$ Cause of the diseases. Give one example of each type.

State any two conditions essential for good health.

Explain how individual health depends on social and mental well-being.