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