Biology theme 1 - life's hierarchy of organization

Levels of organization - smallest to largest

Atom, molecule, organelle, cell, tissue, organ, organ system, organism, population, community, ecosystem, biosphere.

Atom

Smallest part of an element

Molecule

The smallest part of a substance that still has substance

Organelle

Parts of a cell

Cell

Smallest unit of life

Tissue

A group of cells which work for a common function. (muscle, nerves, epithelial, connective)

Organ

A group of tissues which work for a common function

Organ system

A group of organs which work for a common function

Organism

A temporary unit of life (lifespan)

Population

Group of organisms in the same place at the same time

Community

A group of populations

Ecosystem

Community and environment

Biosphere

All life and environment

Cell perspective

Atom, molecule, organelle, cell

Organism perspective

Tissue, organ, organ system, organism

Global perspective

Population, community, ecosystem, biosphere

Lifespan