Final answer:
Skin color does not influence heart rate, whereas gender, body temperature, and age do affect it.
Step-by-step explanation:
The factor that does not influence heart rate among the options provided is A) skin color. Factors such as B) gender, C) body temperature, and D) age are known to influence heart rate. For example, women might have a slightly higher resting heart rate compared to men.
Body temperature, when increased, can cause the heart rate to rise as the body tries to cool itself down. As for age, young children have higher heart rates, which decrease as they grow into adulthood and then may increase again in old age.