Which elements are the most common substance in the human body? A. Hydrogen B. Calcium and nitrogen C. Oxygen D. Carbon

The answer is A. Hydrogen

Explanation:

Your body is made up of mostly water. Although i forgot the certain percent its more than any other thing in your body.

Hope this helped.

A brainliest is always appreciated.

did you fail the test? xd

kelp are large brown algae that live in cool, relatively shallow waters close to the shore. they grow in dense groupings much like a forest on land. these underwater towers of kelp provide food and shelter for thousands of fish, invertebrates, and marine mammal species.

e) all of the above