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Levels of Organization
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1. Subatomic Particle – particles
smaller than an atom
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2. Atoms - smallest component of
an element having the chemical
properties of the element
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3. Molecules - the simplest
structural unit of an element or
compound (Ex. H2O)
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4. Organelles - a specialized
subunit w/in a cell that has a
specific function, & is enclosed
w/in its own lipid bilayer. (Ex.
Nucleus)
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5. Cells – smallest structural,
functional, & biological unit of all
organisms.
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6. Tissues - group of cells having
a similar structure & function
(Ex. Cardiac muscle cells)
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7. Organs - groups of tissues that
have the same structure & function
(Ex. Heart)
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8. Organ Systems - Groups of
organs that have the same structure
& function (Ex. Digestive System)
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9. Multicelled Organism - a living
thing made up of organ systems
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10. Population - a group of similar
organisms (Ex. Prairie dogs)
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11. Community - group of animal
species that live together (Ex.
Zebras & Wildebeests)
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12. Ecosystem - a system formed
by the interaction of a community
of organisms w/ their physical
environment
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13. Biomes - a major biotic
community characterized by the
dominant forms of plant life &
climate (Ex. Rainforest)
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14. Biosphere - regions of the surface
& atmosphere of the Earth where
living organisms exist
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Questions
1. Where on the notes do the properties of life
emerge?
2. Do all living organisms have organs?
3. At which level do we begin to consider abiotic
(non-living) factors?
4. A kidney is an example of what?