सिकंदर महान (Alexander the Great) ने किस अवधि के दौरान शासन किया था, जिसके अंतर्गत उसने भारतीय उपमहाद्वीप के उत्तर-पश्चिमी क्षेत्रों पर आक्रमण किया था?

Gautama Buddha was born at ______.

Consider the following statements regarding a historical period: (i) Animals began to be used for transporting goods during this period. (ii) Trade and transportation developed significantly in this era. (iii) Pottery making using the potter's wheel started in this age. Which historical period is described by the above statements?