Which element is the main component in most of the substances of protoplasm?

Most abundant element in human body is $:-$

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 chemical compounds found in living organisms are classified into which two groups?

Approximately $93$% of cellular matter is composed of which elements?

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.