Which element is present in negligible amounts in the human body?

Living cells contain $60-75\%$ water. How much water is present in the human body?

Arrange the steps for obtaining the acid-soluble and acid-insoluble fractions in the correct sequence.
$I -$ Filtration
$II -$ Slurry (paste)
$III -$ Grinding with trichloroacetic acid
$IV -$ Taking living tissue
$V -$ Obtaining acid-soluble and acid-insoluble fractions

Which of the following are included in inorganic compounds?

What is the normal percentage of water in the human body?

Which of the following forms more than $\frac{1}{2}$ of a cell?