Evolution is repetitive, especially if it produces adaptations that work well. If it’s all about survival, spines do the trick throughout the mollusk world. Scorpion Spider Conch (Lambis scorpio) ...

For us land-dwellers, being crushed under several miles of ocean water wouldn’t end very well. But for a deep-sea dwelling ctenophore, also known as a comb jelly, being brought up to the surface can ...