Define immunity. Differentiate between innate and acquired immunity. Enumerate the factors influencing the development of immunity in an individual. 

Immunity:

Immunity refers to the body's ability to defend itself against harmful pathogens, such as bacteria, viruses, and other microorganisms, as well as abnormal cells like cancer cells. The immune system plays a crucial role in recognizing and neutralizing these threats to maintain the body's health and well-being.

Innate Immunity:

Innate immunity, also known as natural or non-specific immunity, is the first line of defense that an individual is born with. It provides immediate, general protection against a wide range of pathogens without requiring previous exposure to them. Innate immunity involves physical barriers, chemical barriers, and certain cells that quickly respond to potential threats.

• Physical barriers: The skin and mucous membranes act as physical barriers, preventing pathogens from entering the body. The skin's outer layer and the mucus lining in the respiratory and gastrointestinal tracts create an inhospitable environment for many pathogens.

• Chemical barriers: Various chemical substances present in the body's secretions have antimicrobial properties. Examples include enzymes in tears and saliva, acid in the stomach, and antimicrobial peptides in sweat.

• Cellular components: Cells like neutrophils, macrophages, ____ ________ ________ ___ ____ _________ __________ ____ _____ ________ ___.
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