Final answer:
Distributors are responsible for the movement of materials in the downstream portion of a supply chain.
Step-by-step explanation:
Within the downstream portion of a supply chain, distributors are responsible for the actual movement of materials between locations.
Distributors play a crucial role in the supply chain by delivering products to retailers or end customers. They manage the transportation, warehousing, and delivery of goods, ensuring they reach their intended destinations.
For example, in the food industry, distributors transport fresh produce from farms to grocery stores, ensuring the availability of products for consumers.