Final answer:
Substances that absorb and radiate heat slowly have a high specific heat capacity, which is the amount of heat needed to change the temperature of one gram of a substance by one degree Celsius.
Step-by-step explanation:
Substances that absorb and radiate heat slowly have a high specific heat capacity. Specific heat capacity is an intensive property that depends only on the type of substance, not the amount. It is defined as the amount of heat one gram of a substance must absorb or lose to change its temperature by one degree Celsius. For instance, water with its high specific heat capacity takes a longer time to heat up and cool down compared to substances like sand, making water effective in regulating temperatures in the bodies of warm-blooded animals.