It refer to someone who is unable to stand up for his or her self - usually if being told off without offering a defence, or in an argument, or similar conflict.
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Yes they do have a backbone but how many that's the problem! AND THE ONES WHO SAY NO THAT'S NOT TRUE BECAUSE HOW DO THEY FLY WITH NO BACKBONE OR BONES TO CONNET TO THE WINGS
The spinal vertebrae of a shark are made of cartilage, not bone, so you could rightly say sharks are vertebrates with no backbone. If the question referes to an animal with absolutely no spine at all, the next most closely-related animal is the lancelet.
Some names for girls that mean wolf are: Lupa, Varg, or Ulva.
I'm guessing they mean to say the dog is "intact", meaning it has not been spayed or neutered.
Approximately 95% of the creatures on Earth do not have a backbone, so they are classified as invertebrates. These include animals such as insects, worms, mollusks, and arachnids. Only around 5% of Earth's creatures are vertebrates with a backbone.