What is the meaning of immunity?

Immunity refers to the ability of an organism to resist infection or disease, specifically due to the presence of something in the body, often related to its immune system. This concept encompasses the body's capacity to recognize and respond to pathogens, ensuring that it can protect itself from various illnesses.

In this context, the other options do not accurately capture the definition of immunity. The first option refers to germs, which are agents that could lead to infection but do not describe the body's response. The second option mentions cleanliness, which can prevent disease but is not synonymous with the concept of immunity. Lastly, the third option lists microorganisms that cause disease but again, does not address the organism's ability to defend itself against those pathogens. Thus, the definition of immunity as the resistance to infection or disease is the most accurate and comprehensive choice.