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