What term refers to a plant or animal's genetic resistance to disease or infection?

The term that best refers to a plant or animal's genetic resistance to disease or infection is correctly identified as "Biological immunity." This concept encompasses the inherent ability of an organism to fend off pathogens and diseases due to its genetic makeup, which can include various immune responses or characteristics that have evolved over time.

Biological immunity can refer to the adaptive immune system, which is responsible for recognizing and responding to specific pathogens, as well as the innate immune system, which provides a first line of defense against infections. This genetic resistance can be crucial for the survival of species in various environments, allowing them to thrive even in the presence of disease-causing organisms.

When discussing this topic, it's important to recognize the role of evolution in shaping these resistant traits through natural selection. As populations deal with exposure to pathogens, those individuals with genetic variations that confer resistance are more likely to survive and reproduce, passing their advantageous traits to the next generation.