what does the immune system protect the body against?\nchanges of the internal body temperature\nchanges in…

what does the immune system protect the body against?\nchanges of the internal body temperature\nchanges in the temperature of environment\nchanges caused by harmful pathogens\nchanges in the ph of the blood
Answer
Brief Explanations:
The immune system defends the body from harmful pathogens like bacteria, viruses, fungi, etc. It is not mainly responsible for regulating internal body - temperature, environmental temperature changes, or blood pH changes.
Answer:
changes caused by harmful pathogens