Which best describes the relationship between the circulatory system and the respiratory system?
a. the circulatory system is the transport system for the respiratory system.
b. the respiratory system is the transport system for the circulatory system.
c. the circulatory system diffuses red blood cells into the respiratory system to pick up oxygen.
d. the respiratory system transfers hemoglobin to the red blood cells of the circulatory system.

Wjat are substances intentionally added to food to produce a desired effect?

Once you have come to a decision, you should "go" over it and

Rachel wants to improve her body composition by reducing her bmi. she swims with her friends after school two days a week and eats a well-balanced diet. what else should she do to ensure that she properly applies all the necessary fitt principles in her plan? a. she should add more cardiovascular training and weight training to her exercise routine and eat several low-calorie meals throughout the day. b. she should increase her swimming workouts to five days a week and eat a high-calorie diet that equals 2,500 calories. c. she should add a few days of weight training to her exercise routine and consume 4,000 calories a day. d. she should eat a high-protein, low-carbohydrate diet and add five days of weight training to her exercise routine. select the best answer from the choices provided. a b c d mark this and return