Final answer:
A moderate fever is a true example of an innate body defense mechanism that helps fight off infections by conserving iron, inhibiting bacterial growth, and potentially killing pathogens with increased body heat.
Step-by-step explanation:
True. A moderate fever is indeed an example of an innate body defense. The body's immune system comprises both innate and adaptive responses. Innate responses, including fever, act as the body's first line of physiological defense against pathogens. When phagocytic leukocytes destroy a bacterium, they release endogenous pyrogens into the blood, which then circulate to the hypothalamus and reset the body's thermostat. This increase in temperature aids in conserving iron, which is a nutrient needed by bacteria, thus inhibiting their growth. Additionally, the increase in body heat can directly kill pathogens and enhances the activity of the body's protective cells and enzymes, while hindering those of the invading microorganisms.