The contraction of infectious diseases can be avoided by practicing good avoiding contact with and boosting your immune system with immunizations.

hygeine, vectors.

Explanation:

Disease causes the uncomfortable functioning of the organs of the body and disturbs the human physiology. Two main types of diseases are known as infectious and non infectious disease.

The infectious disease might spread in the unhygienic condition. The individual should maintains the hygiene condition and reduces the environmental condition that might increases the infectious disease. Some diseases requires vector for its transmission. The vector must be killed to prevent the chance of the infectious disease.  

Thus, the answer is hygeine and vectors.

fluid balance is an aspect of the homeostasis of organisms in which the amount of water in the organism needs to be controlled, via osmoregulation and behavior, such that the concentrations of electrolytes (salts in solution) in the various body fluids are kept within healthy ranges. the core principle of fluid balance is that the amount of water lost from the body must equal the amount of water taken in.