The atrioventricular valves.
The letter that represents enzyme is B.
Answer:
Its used as validity, and quality of the articles. The main purpose of it is to filter out poor or invalid articles.
Explanation:
Your body needs two key nutrients: calcium and vitamin D. Calcium is the mineral that strengthens bones and teeth, and vitamin D helps the body absorb calcium while improving bone growth. So stuff like <em>yogurt, milk, salmon, tuna, and spinach.</em>