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

Atom

Molecule

Macromolecule

Organelle

Cell

Tissue

Organ

System

Organism

Population

Community

Ecosystem

Biome

Biosphere