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

On worksheet, put words in order from the smallest to largest.

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

Organization in Multi-cellular Organisms Cell – the smallest functional unit of life Tissue – a group of similar cells that perform a particular function Organ – many groups of tissues that work together Organ System – groups of organs that work together to perform a specific function Organism – consists of several organ systems that function together

Work on “I’m Bigger Than You” worksheet.