Sea urchins are purple, red, orange, yellow/orange, and a mix of red and purple.(Sea Urchins come in many shapes sizes and colors.)
Purple sea urchins live in close association with kelp forests. Kelp is their primary food.
They do, which keeps the sea urchin strong and not brittle.
There is not an exact colour but, black, red, purple, and green are some of the most common colours you will see on a sea urchins.
they have 4 babies at one birth until their pregnant again
They get no parental care at all.
It lives to be about 30 years.
The spiky spines of purple sea urchins range in colours depending on the exact species and the maturity of the urchin. They can range from light blue, dark blue, royal blue, indigo, light purple, violet and dark purple.
There are several animals that eat sea urchins. Sea otters, sunflower stars, snails, crabs and some species of fish predate upon sea urchins.
Humans, sea otters, and many more sea creatures eat sea urchins
no one knows how much sea urchins there r