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 NON-living

Organelles “Tiny organs” Made of macromolecules

Cells Made of organelles Basic unit of structure & function LIVING

Tissues The same kind cells working together LIVING

Organs Tissues that work together. LIVING

Organ Systems Organs that work together LIVING

Organisms Entire living things Usually made of systems May be a single cell LIVING

Population Same type of organism living together.

Community Several populations living together Populations 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

Cells Tissues Organs Organ Systems Atom Molecule Macromolecule Organelle Cells Tissues Organs Organ Systems Organisms Population Community Ecosystem Biome Biosphere