Question

a simple nervous system
has information flow in only one direction: toward an integrating center.
has information flow in only one direction: away from an integrating center.
must include chemical senses and vision.
includes sensory information but no effectors.
includes sensory information, an integrating center, and effectors.

Explanation:

A simple nervous system has a basic structure that involves sensory neurons bringing in sensory information, an integrating center (like a simple nerve - net or ganglion) that processes the information, and effectors (muscles or glands) that respond to the processed information. Information flow is not unidirectional in a simple nervous system as it has both afferent (towards the integrating center) and efferent (away from the integrating center) pathways. Also, it doesn't necessarily have to include chemical senses and vision, and it does include effectors.

Answer:

E. includes sensory information, an integrating center, and effectors.