Sea Urchins have an open cardiovascular system. In this system, pores are able to allow blood to slowly diffuse into the organism and provide it with essential nutrients. This is also the same with blood, as it slowly seeps back into the heart to receive oxygen.
Facts about Sea Urchins:
Facts about Sea Urchins:
- Certain species have spikes filled with venom - great for catching food and protection
- As many other organisms do, sea urchins reproduce by releasing eggs and sperm cells in the water. This type of reproduction is called external fertilization.
- Sea Urchins have radial symmetry, meaning that each sea urchin can be divided in equal parts
- People eat Sea Urchins (I have).