Southwest Asia and North Africa are located at the crossroads of

This region is located at the crossroads of three continents: Europe, Africa and Asia. It is actually a combination of two regions, Southwest Asia, also known as the Middle East, and North Africa.

Explanation:

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answer they showed that organic molecules such as amino acids could be produced from inoragnic molecules;

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.