The answer is d) in the blood
A. Cardiorespiratory
because it deals with your heart and lungs.
And if Lydia is out of breathe its dealing with her lungs since cario deals with heart, and respiratory deals with your lungs.
2000 calories a day soo..you welcome
Answer:
The total number of calories a person needs each day varies depending on a number of factors, including the person's age, height, weight, and level of physical activity. In addition, a need to lose, maintain, or gain weight and other factors affect how many calories should be consumed.
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I think B makes the most sense