In the 1500s, new trade networks developed that went beyond those established by

mesoamericans.
greeks.
africans.
arabs.

Arabs

Explanation:

  In 1500s, the new trade networks was basically developed by the Arabs. It is one of the important trade networks which basically include the other small network trade routes that is mainly developed by the Arabs. The trade network is the connection of all the roads, airport lines and the railroads together so that they can share products with each other.

The main aim of trade network is to enhance the productivity of the product and increases the economical balance. After 1500s, the Europeans also open the new trade networks.

radiative zone

explanation    

radiative zone is the layer of the sun which energy is transferred away from the core by radiation. although, the core is the only part of the sun that produces an appreciable amount of heat through fusion. in fact, 99% of the energy produced by the sun takes place within 24% of the sun's radius.