B. Avoid taking supplements unless energy intake is restricted or groups of food are eliminated from their diet
Active vitamin D is required to maintain normal blood calcium and phosphorous levels.
Answer:
When groups of tissues work together, they are called organs. Some examples of organs are the heart, lungs, skin, and stomach. When organs work together, they are called systems. For example, your heart, lungs, blood, and blood vessels work together. They make up the circulatory system.
Explanation:
