Answer:
important members of endocrine system, proper functioning of the nervous and muscular systems.
Explanation:
Hmm not sure but I would give a explanation..
We communicate to outside world with eye contact, hand gestures and nonverbal communication (whistles, whines, screams, etc.). This can be compared to the warning calls made by packs of animals about approaching prey. The world communicates to us in touch (i.e. dog rubbing up against your leg to show affection), gestures (i.e. crossing guard gesturing when to cross the street) and sounds (i.e. train whistle announcing approaching train). Hope this helps!
