What is formed by the combination of atoms?

When a living tissue is ground in trichloroacetic acid to form a slurry and filtered through cheesecloth or cotton,the $.....$ passes through the cheesecloth or cotton.

Select the correct option for the following matches:

Column-$I$	Column-$II$
$(1)$ Water content in a cell	$(a)$ $55-78\%$
$(2)$ Water content in the human body	$(b)$ $70-90\%$
$(3)$ Water content in living organisms	$(c)$ $65\%$

The smallest unit of an element that retains all the properties of the element is:

Which of the following are included in inorganic compounds?

Which information is obtained by elemental analysis?