The most primitive nervous systems consist of structures known as nerve
A) tracts.
B) nets.
C) webs.
D) cords.
E) mazes.

Name: The most primitive nervous systems consist of structures known as nerve A) tracts. B) nets. C) webs. D) cords. E) mazes.
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The most primitive nervous systems, found in organisms like jellyfish, consist of structures known as nerve nets. These are diffuse networks of interconnected nerve cells (neurons) that allow for simple signal transmission without a central brain.

The Most Primitive Nervous Systems Consist of Structures Known as Nerve