One of the most important branch points in the evolution of animals and their nervous systems was the appearance of
A) radial symmetry.
B) bilateral symmetry.
C) the spinal column.
D) specialized cells for transmitting signals.

Question

Quizplus · Accepted Answer

The development of bilateral symmetry allowed for the evolution of an anterior end with sensory organs and a centralized nervous system that could process information from these sensory organs.

Answer: D 
 The evolution of specialized cells for transmitting signals, such as neurons and glial cells, allowed for more complex nervous systems to evolve and facilitated the development of sensory organs and centralized processing centers in the nervous system.

One of the Most Important Branch Points in the Evolution