Levels of Organization

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

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

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

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

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

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

Population Same type of organism living together

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

Ecosystem 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

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