biology scientific study of life lays the foundation for asking basic questions about life and the...
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Biology
Scientific study of life
Lays the foundation for asking basic
questions about life
and the natural world
Why Study Biology?
• To learn how organisms are constructed, how they function, where they live, and what they do
• To help develop, modify, and refine ideas about life
Two Unifying Themes
Hierarchical organization
The power of evolution-
Levels of Organization
Atom
Molecule
Cell
Tissue
Organ
Organ System
molecule
cell
tissue
organ
organ system
atom
Levels of Organization
Multicelled organism
Population
Community
Ecosystem
Biosphere
multicelledorganism
community
population
ecosystem
the biosphere
Life’s Diversity
• Millions of living species
• Millions more now extinct
• Each species has someunique traits
Classifying Life
Domain
Kingdom
Phylum
Class
Order
Family
Genus
Species
Scientific NamesTwo-part name (binomial)
– Humphead parrotfish is Scarus gibbus– First part (Scarus) is genus name– Second name designates a particular species
within the genus
Classification Systems
• Organisms are grouped together based on descent from a shared ancestor
• Three domains exist:
Eubacteria(Bacteria)
Archaebacteria(Archaea)
Eukaryotes(Eukarya)
Origin of life
EubacteriaArchaebacteria
Eukaryotes
Protistans Plants Fungi Animals
Major Groups
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