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