Which of the following is classified as killer, helper, regulator, and memory cells?

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. Tracheobronchial nodes are located near the trachea and bronchi in the chest and drain lymph from the lungs and airways, not from the arm or breast.
B. Axillary nodes are located in the armpit (axilla) and drain lymph from the arm, breast, and upper chest. They are a key part of the lymphatic system for these regions.
C. Inguinal nodes are located in the groin and drain lymph from the lower limbs, external genitalia, and lower abdomen.
D. Cervical nodes are located in the neck and drain lymph from the head and neck region, not from the arm or breast.