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