This animal which is void of brain, heart, bones ... However, Jellyfish are invertebrates, which means they have no backbone and they intake oxygen from water through membranes.

They've often been thought of as very simple organisms - jellyfish are made up of around 98% water and have no bones, no brain and no heart ... they don't have a backbone. Fish have backbones ...

It turns out that resisting temptation isn’t just a human – or even mammalian – skill. A new study has shown that cuttlefish, squishy sea creatures better known for shape-shifting camouflage, can pass ...

No, fish are not mammals. Fish and mammals are two different types of animals ... have backbones to support their bodies, a distinct head, a differentiated brain and nasal, optic and otic ...

Vertebrates – Animals that have a backbone (spine). Warm-blooded (endothermic) – Animals which have a steady and warm body temperature, no matter what the outside temperature is. Birds and ...