after hydrogen and oxygen , Which element makes up alomst all if rhe most common substances in your body?

Calcium is what makes most of our body.

Explanation: 99% of the atoms in the human body come from six elements: Hydrogen (62.9%), oxygen (almost 24%), carbon (nearly 12%), nitrogen (nearly 0.6%), calcium (0.24%) and phosphorus (0.14%). Calcium is on the list as it is essential for our skeleton, which contains 99% of the calcium in our body.