Sumerians were the first people of mesopotamia to use
the plow.
irrigation.
a spoken language.
a number system based on 100.

The correct answer is A. The plow.

A plow is a tillage tool used in agriculture to open furrows in the land before cultivating. The use of this tool has been documented back to the 4th millennium BC in Mesopotamia during the period of the most ancient civilization of the world: the Sumerians. At that time, the plow was first used directly by farmers and, later, animals like bulls and oxen were forced to execute this tool.

norsemen from northern countries had made earlier journeys