Hello there! Cardiovascular endurance has to do with you heart and lungs. Think about it. "Cardio" means heart and cardiovascular has to do with your heart and endurance has to do with how long you last. It has to do with the lungs and the muscles, but muscles isn't an option. The answer is B: heart and lungs.
Once a year minimum, but others would like to have a check up once or twice
filtration in blood and create urine as a waste by product.
Medulla I believe the answer is.
Answer: C skeletal and muscle
Explanation: muscles move bones