Answer:
I believe the question is:
"What were the causes and impact of increased Indian ocean trade in Post-Classical era?"
Step-by-step explanation:
Some of the causes of the increased Indian ocean trade during the Post-Classical era were the increase volume of trade, the tremendous number of people involved and the various interactions happening from culture to culture. The increase in the volume of trade was mainly due to the influence of the Islam religion which allowed the Muslim city-states to participate in the maritime trading. This then increased the items such as gold, ivory and exotic animals coming from southern Africa and the sub-Saharan. Due to new maritime technologies such as the compass and the used of "Junks" (big trading ships), larger cargoes could be transported and this assisted a faster way of trading in bulks. The "astrolabe" (a celestial sphere) was also introduced and this aided the sailors, especially in preventing the risks of maritime trade.