❓ why
Why do sea urchins have such sharp spines?
AnimalsMarine invertebrates
Quick Answer
Sea urchin spines protect them from predators and help them move through rocky habitats. The spines can also trap drifting food and provide leverage on the seafloor.
The Full Story
Sea urchins are echinoderms covered in movable spines that function as armor and as tools. The spines make it harder for fish, crabs, and otters to bite or grab them. In many species, the spines are attached to a hard test, or shell, that forms a strong defensive body. Some urchins can even use their spines and tube feet together to cling to rocks in strong currents. Their tough design is one reason sea urchins have been successful in many marine habitats since ancient times.
Key Facts
1.Sea urchin spines are both defensive and functional
2.Their hard body is called a test
3.They use spines and tube feet together
YouTube Angle
Suggested video title for this topic:
"Why sea urchins turned into spiky armor balls"