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