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

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Presentation transcript:

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 multicelled organism community population ecosystem the biosphere

Life’s Diversity Millions of living species Millions more now extinct Each species has some unique traits

Classifying Life Domain Kingdom Phylum Class Order Family Genus Species

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

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 Eubacteria Archaebacteria Eukaryotes ProtistansPlantsFungiAnimals Major Groups

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