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