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