Final answer:
A fever helps the body fight off invading sickness by inhibiting pathogen growth and stimulating the immune system.
Step-by-step explanation:
A fever helps the body fight off invading sickness by creating a less favorable environment for pathogens and stimulating the immune system. When the body detects the presence of bacteria or viruses, it releases chemicals called pyrogens, which reset the body's thermostat to a higher temperature. This elevated body temperature inhibits the growth of pathogens and speeds up cellular repair processes, helping to fight off the infection. Additionally, a fever causes the immune system to produce more white blood cells, which play a crucial role in the body's defense against pathogens.