Final answer:
The maximum range for the enzyme's activity when the thermal range is 10°C to 40°C is 40°C.
Step-by-step explanation:
The thermal range for an enzyme's activity is given as 10°C to 40°C. The maximum range would be the highest temperature within this range, which is 40°C. Beyond this temperature, enzymes become less active and may lose their activity completely. Enzymes in the human body have their optimum temperatures between 37°C and 40°C.