Final answer:
The signs of heat-related illness include excessive sweating, fatigue, dizziness, headache, nausea, muscle cramps, and a rapid heartbeat.
Step-by-step explanation:
The signs of heat-related illness include excessive sweating, fatigue, dizziness, headache, nausea, muscle cramps, and a rapid heartbeat. These symptoms may indicate a heat stroke, heat exhaustion, or heat cramps. It's important to cool down the body, drink plenty of fluids, and seek medical help if the symptoms worsen.