Which of the following professions would likely conduct research on animal diseases?

The profession that would likely conduct research on animal diseases is a veterinarian. Veterinarians are trained specifically to understand animal health and medicine, which includes diagnosing, treating, and preventing diseases in animals. Their education and training emphasize knowledge of various animal species, their physiology, behavior, and the pathogens that can affect them. This specialized focus enables veterinarians to engage in research that can lead to advancements in animal health practices, treatments, and disease prevention strategies.

On the other hand, a medical doctor primarily focuses on human health and diseases, meaning their research pertains to human medicine rather than animal diseases. A system analyst is a professional who analyzes and designs systems for organizations, often related to technology and software, which has no direct relevance to animal health. Similarly, a data encoder's job involves entering data into systems and does not involve conducting research or working within the field of veterinary medicine or animal health.