1. Levels of Organization

2. Non living
Atoms- Smallest part of matter
Molecule – 2 + bonded atoms

3. Cell- Basic unit of life
Living:
Cell- Basic unit of life
Animal cells- blood cells, bone cells, nerve cells, skin cells
Plant cells- root cells, guard cells, tube cells

4. Tissue The same kind cell working together
Animal tissue- connective, epithelial, muscle, and nerve
Plant tissue- dermal, vascular and ground tissue

5. Organs Tissues that work together
Human organs- Heart, lung, brain, skin, stomach
Plant organs- leaves, stems, and roots

6. Organ Systems Organs that work together
Human Organ Systems- Skeletal system, circulatory, nervous, muscular, integumentary, endocrine, digestive, reproductive, excretory, and respiratory
Plant Organ Systems – root (below ground) and shoot (above ground) system

7. Organism
Entire living things (organisms)
May be a single cell

8. Population
Same type of organism living together

9. Community Several populations living together
biotic (living parts only) interacting

10. Ecosystem
Biotic (living) community plus the abiotic (nonliving) features

11. Biome
Similar ecosystems on earth together

12. Biosphere Whole living layer around the globe
Includes abiotic features

13. Organelle Cell Tissue Organ Organ System Organism Atom Molecule
Macromolecule
Organelle
Cell
Tissue
Organ
Organ System
Organism
Population
Community
Ecosystem
Biome
Biosphere