The answer of all subparts a, b, c of question 3 are as follows,
A) Silk Roads was different from trade in the Indian Ocean because transportation costs were lower because ships could accommodate larger and heavier cargoes, more than camels could.
B)The Silk Road and Indian Ocean trading routes were similar in that they both served the purpose of moving luxury goods from East Asia to the markets of the Mediterranean and Europe via the Middle East.
c) The another similarities between the Indian Ocean and Silk Road are that they both spread Buddhism.
Trade refers to the voluntary exchange of goods or services between economic actors.
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