what is meant by this..... if the body design of squirrel relied only on electrical impulses via nerve cells .The range of tissues instructed to prepare for the coming activity would limited

Dear student
This means that if the body structure of a squirrel was based on the fact that all the nerves had direct contact with all the tissues of squirrel's body, then the range of tissues or we can say distance between nerve impulses and tissues as well as number of tissues would have been limited. 
Hope this helps! 
Regards

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