Search the internet for the answers :3
The human body is mostly made up of water (H2O), and there is one oxygen atom in each molecule of water. Note that, although each water molecule also contains two hydrogen atoms, the atomic mass of hydrogen (about 1) is much smaller than the atomic mass of oxygen (about 16). Because of this, hydrogen contributes less to human body mass than oxygen.
Answer:
10-20% of your daily recommend amount
Answer:
1.to explain slowly and steadily
2.give examples
3.to make sure that the patient understand
