Purpuratus
Strongylocentrotus
Animalia
Echinoderms
Pentamerous
Toothpick
Porcupine
Dome
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
Because the eggs make great omlettes
Nose
Feet
Mouth
Spine
On the beach
Both intertidal area and subtidal areas
Intertidal area only
Subtidal area only
Sea cucumbers
Algae
Other sea urchins
Small fish