Introduction Predator or Prey?  
interactive tutorials
microscope basics
microscope tutorial
microscope measurement
microscope compare
specimen compare
development & embryology
fertilization lab
embryogenesis to hatching
analyzing gene function
ecology & environment
our acidifying ocean
predator & prey
surfing to settlement
basic biology
urchin anatomy
about us
teacher resources
useful links

Do you know what is eaten by sea urchins and what eats sea urchins?