WORLD CIVILIZATION

Detailed explanation-1: -Unicorn (bull) was the animal most commonly represented on the seals. In fact, horse was an animal that was unknown to the Harappan Civilization.

Detailed explanation-2: -Elephants and cows were in plenty being domesticated by the Indus Valley people. Even though the horse was not commonly used by Indus Valley people, a few fossils of horses were excavated from the valley. But there is no evidence to show the presence of lions in the Indus Valley region has obtained.

Detailed explanation-3: -Iron was not found by the inhabitants of Harappa. Since it was a civilization of the bronze age, many metallurgical developments were made in copper and bronze, but not in iron.