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

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

Page 1: Biology Scientific study of life Lays the foundation for asking basic questions about life and the natural world.

Biology

Scientific study of life

Lays the foundation for asking basic

questions about life

and the natural world

Page 2: 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

Page 3: Biology Scientific study of life Lays the foundation for asking basic questions about life and the natural world.

Two Unifying Themes

Hierarchical organization

The power of evolution-

Page 4: Biology Scientific study of life Lays the foundation for asking basic questions about life and the natural world.

Levels of Organization

Atom

Molecule

Cell

Tissue

Organ

Organ System

molecule

cell

tissue

organ

organ system

atom

Page 5: Biology Scientific study of life Lays the foundation for asking basic questions about life and the natural world.

Levels of Organization

Multicelled organism

Population

Community

Ecosystem

Biosphere

multicelledorganism

community

population

ecosystem

the biosphere

Page 6: Biology Scientific study of life Lays the foundation for asking basic questions about life and the natural world.
Page 7: Biology Scientific study of life Lays the foundation for asking basic questions about life and the natural world.

Life’s Diversity

• Millions of living species

• Millions more now extinct

• Each species has someunique traits

Page 8: Biology Scientific study of life Lays the foundation for asking basic questions about life and the natural world.

Classifying Life

Domain

Kingdom

Phylum

Class

Order

Family

Genus

Species

Page 9: Biology Scientific study of life Lays the foundation for asking basic questions about life and the natural world.

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

Page 10: Biology Scientific study of life Lays the foundation for asking basic questions about life and the natural world.

Classification Systems

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

• Three domains exist:

Eubacteria(Bacteria)

Archaebacteria(Archaea)

Eukaryotes(Eukarya)

Page 11: Biology Scientific study of life Lays the foundation for asking basic questions about life and the natural world.

Origin of life

EubacteriaArchaebacteria

Eukaryotes

Protistans Plants Fungi Animals

Major Groups