The first is the one that says all living organisms are composed of cells. They may be unicellular or multicellular.
We contribute a lot to the theory of cellula and also to the first three states. What my fellow scientist says next
The second is the one that says that the cell is the basic unitof life.
And the third one is the one that says that Cells arise from pre-existing cells. (They are not derived from spontaneous generation.)
My name is Robert Hooke, and I discovered cells.I was looking at a cork under a microscope and saw multiple chambers that looked like cells.
My name is Theodor Schwann.My friend Schleiden told me how plants were made of cells.Curious,I decided to look and investigate at animals tissues and discovered that all animals are made of cells.
My name is Matthias Schleiden, and I discovered that all plants are made out of cells,I was looking at all different types of plants and I noticed that they all had something in common.They were made of cells.
My name is Anton van Leeuwenhoek,I observed living cells through simple miscrope.
My name is Rudolf Virchow, and I fond out that cells are made of cells.Because of my investigation , it bacome easier to discover diseases