Answer: The site of the human body that does not have a normal flora is the blood.
Explanation: Normal flora refers to the microorganisms that typically reside in or on the human body without causing harm under normal conditions. These microorganisms play important roles in maintaining the health and functioning of various body sites. However, the blood is considered a sterile environment in healthy individuals, meaning it does not harbor a normal flora. The bloodstream is continuously monitored by the immune system, which works to prevent the entry and growth of microorganisms in order to maintain the body's overall health and prevent infections. If microorganisms are present in the bloodstream, it usually indicates a serious medical condition such as sepsis or bacteremia, which require immediate medical attention and treatment.