In vertebrates,the dorsal nerve cord evolved into a brain and spinal cord,which together constitute which of the following?
A) Central nervous system
B) Brain
C) Cephalization
D) Peripheral nervous system
E) Autonomous nervous system

Question

In vertebrates,the dorsal nerve cord evolved into a brain and spinal cord,which together constitute which of the following?  
A) Central nervous system
B) Brain
C) Cephalization
D) Peripheral nervous system
E) Autonomous nervous system

Quizplus · Accepted Answer

The brain and spinal cord together constitute the central nervous system (CNS) in vertebrates. The dorsal nerve cord is a defining feature of the CNS, and it has evolved through cephalization (the evolutionary trend toward concentration of nerve tissue and sensory organs at the anterior end of the organism). The peripheral nervous system (PNS) and autonomous nervous system (ANS) are separate components of the nervous system but are not specifically related to the evolution of the dorsal nerve cord into the CNS.

In Vertebrates,the Dorsal Nerve Cord Evolved into a Brain and Spinal