Answer:
Military communications have to be coded to keep them secret from the enemy. However the process of coding and decoding are time consuming processes. Furthermore the codes may be broken by the enemy. Nations have devoted considerable effort trying to create unbreakable codes. In World War II both Germany and Japan thought they had such unbreakable codes, but in fact these codes were broken and their most vital information were readily available to their enemies.
Explanation:
Technically, no, it is false that China has finally halted the spread of the Gobi Desert by planting trees, since although they are currently using this tactic, it has not led to a full "halt".
European countries use trade to gain wealth
The stronger countries in Europe in the 1400s and 1500s - England, Spain, France and Portugal.
