State whether the following statements are true or false:
All diseases have immediate and contributory causes. Most of the diseases will have many causes,rather than one single cause.

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(TRUE) The statement is True.
Diseases are rarely caused by a single factor. They typically result from a complex interaction of factors.
$1$. Immediate cause: The primary organism or factor that directly causes the disease (e.g.,a virus or bacteria).
$2$. Contributory cause: Factors that make an individual more susceptible to the disease,such as poor nutrition,lack of public health facilities,or genetic predisposition.
Therefore,most diseases have multiple causes rather than one single cause.

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$(a)$ State the method of transmission of each of the following diseases:
$(i)$ Cholera
$(ii)$ $AIDS$
$(iii)$ Malaria
$(iv)$ Pneumonia
$(b)$ Name the disease a person will get if the pathogen targets the liver of a person.

State whether the following statement is true or false:
Syphilis and $AIDS$ are transmitted by casual physical contacts.

Fill in the blanks:
$(a)$ . . . . . . disease continues for many days and causes . . . . . . on the body.
$(b)$ . . . . . . disease continues for a few days and causes no long-term effect on the body.
$(c)$ . . . . . . is defined as physical,mental,and social well-being and comfort.
$(d)$ Common cold is a/an . . . . . . disease.
$(e)$ Many skin diseases are caused by . . . . . . .

How are signs of a disease different from symptoms of a disease?

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