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