the part of the Earth that contains all ecosystems (largest level)

living and non living in area (2nd largest level)

all the species in an area (3rd largest level)

all of one species in an area (4th largest level)

individual living things (5th largest level)

group of cells (6th largest level)

collection of living matter enclosed by a barrier (7th largest level)

group of atoms; smallest unit of most chemical compounds (smallest level)

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PCS Liv Env

Levels of Organization

Term	Definition
biosphere	the part of the Earth that contains all ecosystems (largest level)
ecosystem	living and non living in area (2nd largest level)
community	all the species in an area (3rd largest level)
population	all of one species in an area (4th largest level)
organism	individual living things (5th largest level)
tissues	group of cells (6th largest level)
cells	collection of living matter enclosed by a barrier (7th largest level)
molecules	group of atoms; smallest unit of most chemical compounds (smallest level)