Answer:
either birds pick them up and drop them or the wind makes them travel like dandelions, this is because some are shaped to float and glide. Lastly some seed pods are designed to explode and throw their seeds at large distances from the parent plant
The best and most correct answer among the choices provided by your question is the last choice or letter D.
The existence of the Silk Road was one of the achievements occured during Tang and Song periods.
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The answer is NAFTA hope that helps