Question

question 1-9
both of these organ systems help to protect the body from infection by blocking external pathogens and regulating body temperature
○ integumentary and circulatory
○ integumentary and reproductive
○ immune and digestive
○ digestive and lymphatic

Explanation:

The integumentary system (skin, hair, etc.) blocks external pathogens as a physical barrier and regulates temperature via sweating/vessel dilation. The circulatory system helps by transporting immune cells to fight infections and distributing heat to regulate body temperature. Other pairs lack both functions: reproductive, digestive, lymphatic, and immune systems do not share both pathogen blocking and temperature regulation roles.

Answer:

Integumentary and Circulatory