Levels of Organization

ATOMS• Smallest part of matter

• NON-living

Molecules • 2 or more bonded atoms

• Form compounds

• NON-living

Macromolecule• Very large molecules

• Proteins, fats, carbohydrates, nucleic acids

• NON-living

Organelles• “Tiny organs”

• Made of macromolecules

Cell• Made of organelles

• Basic unit of structure & function

• LIVING

Tissue• The same kind cell working together

• Living

Organs• Tissues that work together

• Living

Systems• Organs that work together

• Living

Organism• Entire living things (organisms)

• Usually made of systems

• May be a single cell

• Living

Population• Same type of organism living together

Community• Several populations living together

• Population interact

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

Biome• Similar ecosystems on earth together

Biosphere • Whole living layer around the globe

• Includes abiotic features

http://people.hofstra.edu/geotrans/eng/ch8en/conc8en/envisys.html

AtomMolecule

MacromoleculeOrganelle

Cell

TissueOrgan

SystemOrganism

PopulationCommunityEcosystem

BiomeBiosphere