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The Hierarchy or Levels of
Biological Organization
Subatomic (particle)
• units of
matter
below the
size of an
atom
Atom
basic unit of matter
Molecule
electrically neutral
group of two or more
atoms held together
by covalent chemical
bonds
(Compound- pure chemical substance
consisting of two or more different
chemical elements)
Caffeine
Macromolecule
• very large molecule,
composed of
hundreds or
thousands of atoms
• DNA or protein, esp. a
polymer,
Organelle
• Specialized
part of a cell
having some
specific
function
Cells
Basic unit of life
Tissue
a group of cells that perform a similar function
Organs
a collection of tissues joined as unit
to serve a common function;
Organ Systems
is a group of organs that work together to
perform a certain task.
Organism
A single
individual
Population
A group of organisms of the same type
(species) living in the same area.
Community
Populations that live together in a
given area.
(Human population, House Elf population, Bacteria population)
Ecosystem
Communities and the nonliving
surroundings. (Urban Ecosystem)
Biome
A major regional or global biotic
community
Deciduous Forest of England
Biosphere
All of the land, water and air (biomes) where organisms
can live.
Earth
Planets
Solar Systems
Galaxies
Universe
Realm
of
Ecology