Differentiate exogenous and endogenous pyrogens, and provide an example of each.

Exogenous pyrogen:

Exogenous pyrogen may be defined as a substance that produce fever from the outside environment. The exogenous pyrogen are heavier in weight than endogenous pyrogen. Generally, lipopolysaccharide, bacterial toxins and virus acts as exogenous pyrogen.

Endogenous pyrogen:

Endogenous pyrogen may be defined as the substance that produce fever from the inside environment. The exogenous pyrogen are lighter in weight than exogenous pyrogen. Generally, interleukin and tumor necrosis factors acts as endogenous pyrogen.

not necessarily. higher fitness requires the organism to be reproductive successful. for example, an organism at age 10 with 15 offspring is much more fit than an organism at age 15 with only 5 offspring.