Explain the limitations of urban models in explaining or predicting urban structure and growth

the answer is c. according to past decisions, free speech is not unlimited.

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.

the answer for this question on edg. is 8/5