The answer is nervous system and head.
The three axes in bilateral symmetry are the same as in by radial symmetry, however there is only one set of symmetrical sides in bilateral symmetry, the lateral sides, as the other two sides, known as the dorsal (back) and ventral (belly) surfaces, are dissimilar.
Insects, fish, amphibians, reptiles, birds, and mammals all have bilateral symmetry.
The component of an animal's body known as the nervous system is responsible for controlling behavior and sending messages throughout the body. The peripheral nervous system (PNS) and central nervous system (CNS) are its two major components in vertebrates (PNS). The spinal cord and brain are both parts of the CNS.
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