Question

what makes the nervous system complex? it involves many parts working together to send and receive messages. it ensures that animals are able to move and breathe. it works in a way that is similar to two people having a conversation. it is working all the time, even when someone is resting.

Explanation:

The nervous system has multiple components like neurons, the brain, and the spinal - cord that collaborate to transmit and receive signals, which is what makes it complex. Other options do not directly address the complexity aspect.

Answer:

It involves many parts working together to send and receive messages.