Echinoderms
Strongylocentrotus
Animalia
Purpuratus
Sea cucumbers
Algae
Small fish
Other sea urchins
Porcupine
Dome
Pentamerous
Toothpick
On the beach
Both intertidal area and subtidal areas
Subtidal area only
Intertidal area only
Feet
Mouth
Spine
Nose
Because the eggs make great omlettes
Because sea urchins have large numbers of relatively big eggs
Because a sea urchin's egg is relatively big
Because sea urchins have large numbers of eggs