3. CELL THEORY makes 3 Claims
1. All living organisms are made of 1 or more cells
2. Cells come only from other living cells
3. The cell is the basic unit of life ( smallest structure which can carry out life processes )

4. Scientific claims must be based on evidence.
What is the EVIDENCE used to propose the idea that
All living things are made of one or more cells?

5. Evidence for claim #1 of cell theory begins with Robert Hookes observation of Cork ( from a tree ) in his actual drawing is on the lower left. Hooke used the word Cells for the small boxes he saw.

6. Mathias Schlieden observes cells in all plants he studies
Mathias Schlieden observes cells in all plants he studies. He proposes the claim that all plants are made of cells

7. Theodore Schwann observes animal tissues
Theodore Schwann observes animal tissues. Proposes the claim that all animals are made of cells

8. Animal cells

9. FUNGUS CELLS

10. Rudolph Virchow proposes the claim that living cells come only from other living cells when cells divide.

11. CELLS DIVIDING to form new ( daughter ) Cells

12. First Cell divisions of a Frog egg… forming a small frog Embryo

13. Human Cell beginning to divide
Human Cell beginning to divide. You can see chunks of DNA called chromosomes being pulled to opposite sides of the cell as it divides

14. CELL THEORY 1. All living organisms are made of 1 or more cells
2. Cells come only from other living cells
3. The cell is the basic unit of life ( smallest structure which can carry out life processes