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