"A football quarterback can simultaneously make calculations of receiver distances, player movements, and gravitational forces. This best illustrates the activity of multiple"

This best illustrates the activity of multiple: neural networks.

Explanation:

The explanation of the neural networks in this example, is that the neural conexions can be multiple, this means that the neurons are interconnected.  The brain communicates among neural networks and  this allows more than one actvity or action to happened at a moment. The network recieves incoming and outcoming signals an work whith all this information.