Solution

More than 2,000 seals have been excavated from the Indus Valley sites. A humped bull, elephant and rhinoceros engraved on some seals indicate that these animals may have been considered sacred. These seals were probably used for trade or for rituals. These seals provide us with a lot of information about the life and culture of the Indus Valley people. The discovery of similar kind of seals among the ruins of Mesopotamian cities show that the Indus people had trade links with Mesopotamia