Bone is composed of __ percent calcium. 39 10 50 63 25

## Step 1<br />The question is asking for the percentage of calcium in bone. This is a fact-based question, and the answer can be found in various scientific literature and studies.<br />## Step 2<br />According to the information provided, the average human bone is composed of approximately 10% calcium. This is a well-known fact in the field of biology and medicine.<br />## Step 3<br />It's important to note that this percentage can vary slightly depending on the specific bone and the individual's health. However, the average percentage is 10%.