What is the smallest structural and functional unit of a living organism?

Protoplasm was first observed by . . . . . . .

The living component of the cell was termed by $Dujardin$ as:

$P -$ Assertion: The cell is the structural and functional unit of life. $Q -$ Reason: New cells do not arise from pre-existing cells.

Unicellular organisms are capable of:
$(i)$ Having an independent life.
$(ii)$ Organ development.
$(iii)$ Performing metabolic activities for life.
$(iv)$ Tissue constitution.

Who coined the term 'protoplasm'?