Several features are unique to vertebrates. Complete the following sentences related to vertebrate characteristics by selecting from the terms provided.

For the majority of vertebrates, the is replaced by the vertebral column during embryonic development.

Vertebrates also have a well-differentiated head with three pairs of well-developed .

In addition to these two key characteristics, this group possesses a group of embryonic cells called the that contribute to the development of many vertebrate features.

These features include a heart and a .

These and other internal organs are surrounded by an __ that provides extraordinary powers of movement.

Organisms with an internal backbone, sometimes known as a vertebra, are referred to as vertebrates. They have a robust bone skeleton that anchors muscle and supports the body's tissue. Invertebrates are defined as animals without spines.

Mammals typically have hair or fur on their body and warm blood. Mammals give birth to live young, which their mothers nourish with milk. Humans are mammals, but lions, cats, and sheep are other examples of mammals. Birds have beaks, feathers, wings, and two legs. They also have warm-blooded bodies. On land, they lay their eggs.

In water, fish both mate and lay their eggs. They lack lungs and have gills in place of legs. Reptiles are land- and water-based animals. They are cold-blooded and have scales. This indicates that they require a warm environment because they are unable to stay warm on their own.

Therefore, For the majority of vertebrates, the vertebral column is replaced by the vertebral column during embryonic development.

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