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