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