$A$ physical or functional change that causes discomfort or disability under normal conditions is known as:

Which of the following is/are inconsistent with a healthy individual?
$(1)$ Increased efficiency
$(2)$ Higher productivity
$(3)$ Increased longevity of people
$(4)$ Increase in infant and maternal mortality rates

$A$ person showing unpredictable moods, outbursts of emotion, quarrelsome behaviour and conflicts with others is suffering from

The state of complete physical,mental,and social well-being is the definition of which of the following?

$A$ - Acid in the stomach and saliva in the mouth are examples of physiological barriers.
$R$ - Tears from eyes are an example of a physical barrier.

Which of the following is not considered a parasite?