Final answer:
The Nigerian postal services include Ordinary Letters and Registered Letters, essential for communication and mail security.
Explanation:
Nigerian Postal Services: The postal system in Nigeria plays a crucial role in facilitating communication and the exchange of goods. It provides services such as sending letters, parcels, and registered mail.
Ordinary Letters: Ordinary letters refer to regular mail items that do not require special handling or tracking. They are commonly used for personal correspondence or sending non-urgent documents.
Registered Letter: A registered letter is a more secure form of mail that provides proof of mailing and delivery. It offers tracking and requires a signature upon receipt, making it a reliable option for sending important or valuable items.
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