Final answer:
The fingertips are the best part of the hand for sensing temperature due to the high concentration of thermoreceptors.
Step-by-step explanation:
The fingertips are the best part of the hand for sensing temperature. The skin on the fingertips is highly sensitive and contains a higher concentration of thermoreceptors, which are the sensory receptors responsible for detecting temperature changes. These thermoreceptors are able to quickly detect even slight changes in temperature, allowing us to perceive sensations of warmth or coldness on our fingertips.