Question

which body system produces proteins that help fight infections?
o the digestive system
o the immune system
o the muscular system
o the circulatory system

Explanation:

The immune system produces antibodies, which are proteins that help fight infections by recognizing and neutralizing pathogens like bacteria and viruses. Other systems have different primary functions. The digestive system processes food, the muscular system enables movement, and the circulatory system transports blood and nutrients.

Answer:

B. the immune system