Areas of lymphoid tissue specifically found in the gastrointestinal tract are termed:

A. Species specific immunity refers to the natural resistance that a species has to certain diseases that affect other species. This type of immunity prevents humans from contracting certain diseases that are specific to other animals, like certain viruses or bacteria.
B. Specific immunity refers to the adaptive immune response that targets particular pathogens, but it doesn't apply to the protection humans have against animal-specific diseases.
C. Nonspecific immunity refers to the general defense mechanisms (like skin or phagocytes) that protect the body from a broad range of pathogens, not specifically from animal diseases.
D. Active immunity involves the body producing its own immune response after exposure to a pathogen, but it does not specifically describe the protection from diseases of other

A. Interleukin is a type of cytokine that plays a role in the immune system, but it is not another name for immunoglobulin.
B. Antibodies are also known as immunoglobulins. They are proteins produced by B cells that recognize and bind to specific antigens to help neutralize or destroy pathogens.
C. Interferon is another type of protein that plays a role in the immune response, particularly in inhibiting viral replication, but it is not the same as immunoglobulin.
D. Antigen is a foreign substance that induces an immune response, but it is not synonymous with immunoglobulin.