Matthias Jakob Scleiden and Theodor Schwann proposed cell theory in 1838-39.
1 All the organism are made up of cell.
2 All cell arise from pre-existing cells.
3 All the cells are made up of similar chemicals and show similar activities.
4 Function of organisms depend on the function of carried out by different cells in that organism.
5 You can see green patterns in plant cells, they are chloroplasts.