Which of the following animals is known to have a backbone?

The shark is known to have a backbone because it is classified as a vertebrate, which is a term used for animals that possess a vertebral column or spine. This structural feature is a key characteristic of vertebrates, which includes animals like mammals, birds, reptiles, amphibians, and fish, to which sharks belong. Sharks have a cartilaginous skeleton, which means their backbone is made of cartilage rather than bone, but it still qualifies as a backbone.

In contrast, squids, bread mold, and fungi do not possess backbones. Squids are mollusks and do not have a backbone; they are classified as invertebrates. Bread mold and fungi belong to the kingdom Fungi and also lack a backbone, as they do not have a skeletal structure like vertebrates. Thus, the shark stands out as the only animal among the options listed that possesses a backbone.