1. Levels of
Organization
of Life
Presentation based on one from http://people.hofstra.edu/geotrans/eng/ch8en/conc8en/envisys.html

2. Atom
Molecule
Macromolecule
Organelle
Cell
Tissue
Organ
System
Organism
Population
Community
Ecosystem
Ecosphere

3. ATOMS
• Smallest part of matter
• NON-living

4. Molecules
• 2 or more bonded atoms
• Form compounds
• NON-living

5. Organic molecules
carbohydrates,
proteins,
lipids and
nucleic acids.
Inorganic molecules
Water,
Salts

6. Macromolecule
• Very large molecules
•NON-living

7. Organelles
• “Tiny organs”
• Made of macromolecules

8. Cell
• Made of organelles
• Basic unit of structure & function
• LIVING

9. Tissue
• The same kind cell working together
• Living

10. A tissue is a group of cells of similar
structure that perform a shared function
Animal tissues :
Tissues found in the leaf muscle
upper epidermal
tissue
palisade mesophyll
tissue
spongy mesophyll
tissue
lower epidermal
tissue
nervous
Cross-section of a leaf
Slide taken from clickbiology.com

11. Organs
• Tissues that work together
• Living

12. An organ is a structure made of a group of tissues
working together to perform specific functions
heart lungs liver
stomach brain kidneys
Plant organs include the stem and the leaves
Slide taken from clickbiology.com

13. An organ system is a group of organs that
coordinate to perform related functions
lymphatic digestive reproductive skeletal endocrine
system system system system system
respiratory excretory muscular nervous circulatory
system system system system
system
Slide taken from clickbiology.com

14. Systems
• Organs that work together
• Living

15. Organism
• Entire living things
(organisms)
• Usually made of
systems
• May be a single cell
• Living

16. What type of organism is this?
Unicellular or pluricellular?
http://israel-biologialacelula.blogspot.com/

17. Population
• Same type of
organism living
together

18. Community
• Several populations living together
• Population interact

19. Ecosystem
• A biotic (living) community plus the
abiotic (nonliving) features

20. Ecosphere
• Whole living layer around the globe
• Includes abiotic features (so all
Ecosystems together)

21. De: http://loqueheaprendidode.blogspot.com/2011/02/de-gaia-mi-dialogo-n-32-con-
gaia-un.html

22. Can you write the
levels of
organization of
life?

23. Now, say an example of
Atom
Molecule
Macromolecule
Organelle
Cell
Tissue
Organ
System
Organism
Population
Community
Ecosystem
Ecosphere

24. • http://1.bp.blogspot.com/-u6U98UbaBjA/TViHmtnm_-I/AAAAAAAAEqg/YARN9kC4PPY/s1600/Green%252BEarth
%252BEcology%252BwAl%252Btangledwing.png