____________ made an addition to cell theory that  all cells arise from  pre --existing cells.

__________was the first person to observe cells.

The smallest cells are  in____________.

Prokaryotic cell contains a _______________ cell wall.

________ is a basic structural and funtional unit of life.

_________ stated that cell  plant tissues are composed of  cells.

The longest cells are ___________cells.

Name a unicellular organism?