If atelephone is used for communication by humans over 25 kilometers or more, then atelephone is used for communication by humans between what span?

Answer choices:
- 25 kilometers or more
 - members of their own species
 - global ecosystems
 - 5 centimeters
 - 1 meter
 - Males and females
 - A set number of times
 - 4 microns

 

 25 kilometers or more         