1. 5.5 Multicellular Life Multicellular organisms: Living things made of more than one cell ALL animals and land plants are multicellular Multicellularity has evolved at least 25 times first appeared several billion years ago in cyanobacteria

2. 5.5 Multicellular Life Organization (large to small) 1.Organism- A living thing -ex. human

3. 5.5 Multicellular Life Organization (large to small) 1.Organism 2.Organ System- organs that work together to do a job -ex: circulatory system

4. 5.5 Multicellular Life Organization (large to small) 1.Organism 2.Organ System 3.Organ- tissues that work together to do a job -ex: stomach

5. 5.5 Multicellular Life Organization (large to small) 1.Organism 2.Organ System 3.Organ 4.Tissue- Similar cells that work together to do a job -ex: digestive tissue

6. 5.5 Multicellular Life Organization (large to small) 1.Organism 2.Organ System 3.Organ 4.Tissue 5.Cell- smallest unit of life Ex- brain cell

7. 5.5 Multicellular Life Organization (large to small) 1.Organism 2.Organ System 3.Organ 4.Tissue 5.Cell 6.Organelle- part of a cell with a specific job -ex: mitochondria

8. 5.5 Multicellular Life Organization (large to small) 1.Organism 2.Organ System 3.Organ 4.Tissue 5.Cell 6.Organelle 7.Molecule- 2+ atoms held together by bonds Ex- water

9. 5.5 Multicellular Life Organization (large to small) 1.Organism 2.Organ System 3.Organ 4.Tissue 5.Cell 6.Organelle 7.Molecule 8.Atom- basic unit of matter -ex: carbon

10. 5.5 Multicellular Life Organization (large to small) 1.Organism 2.Organ System 3.Organ 4.Tissue 5.Cell 6.Organelle 7.Molecule 8.Atom 9.Subatomic particles- piece of matter smaller than atoms -ex: proton

11. 5.5 Multicellular Life Organization (large to small) 1.Organism 2.Organ System 3.Organ 4.Tissue 5.Cell 6.Organelle 7.Molecule 8.Atom 9.Subatomic particles 10.Energy- the ability to move things

12. 5.5 Multicellular Life Organization (large to small) 1.Organism 2.Organ System 3.Organ 4.Tissue 5.Cell 6.Organelle 7.Molecule 8.Atom 9.Subatomic particles 10.Energy- the ability to move things

13. 5.5 Multicellular Life Cellular differentiation –Multicellular organisms develop specialized cells -Ex: brain cells, muscle cells, skin cells…

14. 5.5 Multicellular Life Stem Cells –Undifferentiated cells that can differentiate