Explanation: The non-luminous zone, often referred to as the blue zone, is the part of the flame where complete combustion occurs. This area is the hottest because it has the most efficient combustion, producing the maximum amount of heat.

Explanation: Dengue fever is transmitted by mosquitoes of the species Aedes aegypti. These mosquitoes are the primary vectors for the Dengue virus, which is responsible for causing Dengue fever in humans. The disease is characterized by high fever, severe headaches, pain behind the eyes, joint and muscle pain, rash, and bleeding manifestations.

Explanation: William Harvey, an English physician, is credited with the discovery of the systemic circulation of blood. In 1628, he published his work "De Motu Cordis" (On the Motion of the Heart and Blood), which detailed how blood circulates through the body, driven by the pumping action of the heart.

Explanation: The liver is the largest gland in the human body and performs a wide range of functions, including detoxifying harmful substances, producing bile for digestion, and regulating various metabolic processes.

Explanation: A parity bit is a binary digit added to a set of binary data to ensure that the number of bits with a value of 1 is even or odd, depending on the type of parity being used (even or odd parity). It helps detect errors that may have occurred during data transmission or storage by checking if the parity matches the expected value.

Explanation: The small intestine is the primary site for nutrient absorption in the digestive system. It has three parts: the duodenum, jejunum, and ileum. The majority of nutrient absorption occurs in the jejunum and ileum.