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The length of their hair reduces. This is because the length of hair is dependent on the growth phase (anagen phase) of the hair follicles. When one is young, the cells of the papilla divide more rapidly and hence cause the length of the hair to be long before reaching transitional phase (catagen phase) and then shed off in the telogen phase. The older one gets, the papilla cells do not divide as rapidly and the length of the hair shortens with age.






The type of association which is expected between a person's age and hair length is negative. The correct option is B. The length of hair decrease with the increase in age.

What are the dependent and independent variables?

The growth of the body depends on many variables such as age, nutrition, genes, synthesis of substances in the body, etc.

Hair growth depends upon the synthesis of keratin protein in the body.

With the increase in age, many proteins and hormone synthesis reduce, which shows the effect on the body.

Thus, the correct option, B, is negative.

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