Sea urchins are purple, red, orange, yellow/orange, and a mix of red and purple.(Sea Urchins come in many shapes sizes and colors.)
there are excatly 3million purple sea urchins
Sea urchins come in a variety of colors including purple, red, green, black, and white. Each species of sea urchin can have its unique color patterns.
its sharp spines
they are venomous
Sea urchins do NOT shoot there spines. They can simply let them pop out (sort of like a porcupine). Most people make this mistake... neither a porcupine or sea urchin SHOOT there spines. They do harden and stick out farther but they DO NOT SHOOT THEM!
No. Not even close. Sea urchins are small, herbiverous marine invertebrates with spines.
A sea urchin's body is covered in sharp spines.
sea anemones have stinging tentacles, and sea urchins have spines.
So that the sea urchin can protect itself from is enemies, it also has venomous spines. They also use their spines to kill other sea ceatures, so they can eat them.
they have spines that react to predators
Mostly for protection and also for locomotion.