No. Animals, or eukaryotic organisms of the kingdom Animalia, include creatures like snails which do not have a skeletal structure. Although the question doesn't distinguish, exoskeletons are found on some animals (insects, particularly) and are also skeletons without being endoskeletons.
Worms spring to mind they have no hard parts at all. ...
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...uman skeletons have a lot in common with the skeletons of many animals, but mammals in specific. You will note we all have skulls, ribs, a backbone, and so forth, but one thing that is especially int... more
...r somewhat depends on what you call an animal.Animals with backbones or spinal columns are called vertebrates. Most large land animals and fish fall into this category. Fish, reptiles, amphibians and ... more