Biology

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Biology

• Scientific study of life
• Lays the foundation for asking basic questions
  about life and the natural world

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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

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Two Unifying Themes

• Hierarchical organization
• The power of evolution
• -

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Levels of Organization

• Atom
• MoleculeCell
• Tissue
• Organ
• Organ System

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Levels of Organization

• Multicelled organism
• Population
• Community
• Ecosystem
• Biosphere

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Lifes Diversity

• Millions of living species
• Millions more now extinct
• Each species has someunique traits

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Classifying Life

• Domain
• Kingdom
• Phylum
• Class
• Order
• Family
• Genus
• Species

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Scientific Names

• Two-part name (binomial)
• Humphead parrotfish is Scarus gibbus
• First part (Scarus) is genus name
• Second name designates a particular species
  within the genus

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Classification Systems

• Organisms are grouped together based on descent
  from a shared ancestor
• Three domains exist

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Major Groups
Protistans
Plants
Fungi
Animals
Eukaryotes
Archaebacteria
Eubacteria
Origin of life