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