LEVELS OF ORGANIZATIONS

unicellular

only one cell

multicellular

many cells

atoms

smallest unit of matter

molecules

groups of the same & diff. kinds of atoms

organelles

specialized structures that perform important functions (small organs of the cell)

cell

basic unit of life

tissues

made of the same type of cells grouped together

organs

made up of diff tissues

organ systems

group of organs (digestive system, circulatory system)

organism

cells, tissues, organs, organs systems work together

population

groups of individuals

community

groups of different populations

ecosystem

group of all organisms

biomes

groups of ecosystems

biosphere

where life exists