Visit Your Local PBS Station PBS Home PBS Home Programs A-Z TV Schedules Watch Video Donate Shop PBS Search PBS
    
Click to return to the Evolution Home Page
darwin change extinction survival sex humans religion
sex width=    
   
The Advantage of Sex Source Credits

Lovers by Paolo Fiammingo
© Ali Meyer/CORBIS

Blue spotted salamander
© 2000 http://www.arttoday.com

DNA
© 2000 http://www.arttoday.com

Strawberries
© 2000 http://www.arttoday.com

Alice and the Red Queen
Public domain

Sickle-shaped erythrocytes (red blood cells)
© 2001 WGBH Educational Foundation and Clear Blue Sky Productions, Inc.
All Rights Reserved

Sickle cell anemia
© Lester V. Bergman/CORBIS

Sea anenome
© 2000 http://www.arttoday.com

Photomicrography showing Daphnia Pulex, by C.G. Grand
© 2000 http://www.arttoday.com

Butterflies
© 2000 http://www.arttoday.com

Top minnows video
© 2001 WGBH Educational Foundation and Clear Blue Sky Productions, Inc.
All Rights Reserved
  related web activities  
   
Sex and the Single Guppy
Learn how exhibitionism has an evolutionary payoff.
 
 
The Mating Game
Help our contestants find the perfect date.
 
 
  related topics  
   
  Adaptation and Natural Selection  
   
  Evolution of Diversity  
   
  Evolution Since Darwin  
 
 
         
 
Videos Web Activities Site Guide About the Project FAQ Glossary Site Map Feedback Help Shop