Answer:

There are 3 major parts of the cell theory:

All organisms are made of cells.

All existing cells are produced by other living cells.

The cell is the most basic unit of life.

There are 5 contributors to the cell theory:

Robert Hooke

Anton van Leeuwenhoek

Matthias Schleiden

Theodor Schwann

Rudolf Virchow

Each of the above contributors produced evidence through investigations and experiments that led to today’s cell theory!