After traveling through Europe, the President of the United States returns and signs an executive order changing the system of measurements in the U. S. from the imperial system of measurement to the metric system.

d is the answer. leo should include the source.

1.d 2.a c.!

islam spread slowly through much of africa through trade and preaching.

a best description that resulted a division among labor in the early farming communities in their period was there was a change in their society in terms of having social roles to develop and change that led complications and divisions in the society.