Answer:
Cardio- is a combining form used like a prefix meaning “heart.” It is used in many medical and scientific terms. Cardio- comes from the Greek kardía, meaning “heart.” In fact, the English word heart and the Greek kardía are related. Learn more at our entry for heart.
Explanation:
Answer: Physical exercise
Explanation: Cardio refers to why physical exercise which improves the rate at which a human heart performs its duties.
