Do not have a backbone
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What is a backbone in a fish?
A bone structure that makes up the vertebral column (backbone). There are two types of fish that have these. The first is a skeleton structure made up of cartilage, as in cartilaginous fish, the other is bone found in bony fish. Both types have a vertebral column (backbone). Do All Fish Have Backbones? What The Purpose Of A Backbone?
Why do fish have bones in their back?
One is a bone that is found in bony fish and the other is a skeleton structure that is made up of cartilage. All fish do have some type of backbone. The main purpose is to help protect the fish vital muscles, organs, and other body parts. It also helps to support the structure of the fish.
Do jellyfish have a backbone?
Despite their names, Jellyfish and Starfish are not fish and therefore do not have backbones. In fact, they are plankton and don even have any bones, brain, or heart. Hagfish have no backbone but are still classed as fish.
Can a fish live without a backbone?
It is part of the main structure of a fish and without a backbone, the fish could not live. Even if all fish have a backbone, they do not grow them all the same way. Ray-finned fish, which are the ones that have bony spines supporting fins of skin, grow their spines from using two different cells.